Unfair Stamp not playable after getting Ko'd

I played a game of pult vs lucario, and every time the lucario took a knock out, i couldnt use my unfair stamp. Here's the battle log:

Setup
WaserAdept chose heads for the opening coin flip.
WaserAdept won the coin toss.
WaserAdept decided to go first.
WaserAdept drew 7 cards for the opening hand.

• 7 drawn cards.
  • Crispin, Basic Darkness Energy, Shaymin, Lillie's Determination, Moltres, Basic Darkness Energy, Dragapult ex
  Hobie1995 drew 7 cards for the opening hand.
• 7 drawn cards.
  WaserAdept played Moltres to the Active Spot.
  Hobie1995 played Solrock to the Active Spot.

WaserAdept's Turn
WaserAdept drew Drakloak.
WaserAdept attached Basic Darkness Energy to Moltres in the Active Spot.
WaserAdept ended their turn.

Hobie1995's Turn
Hobie1995 drew a card.
Hobie1995 played Riolu to the Bench.
Hobie1995 played Fighting Gong.

• Hobie1995 drew Lunatone.
• Hobie1995 shuffled their deck.
  Hobie1995 played Lunatone to the Bench.
  Hobie1995 played Riolu to the Bench.
  Hobie1995's Lunatone used Lunar Cycle.
• Hobie1995 discarded Basic Fighting Energy.
• Hobie1995 drew 3 cards.
  Hobie1995 played Poké Pad.
• Hobie1995 drew Genesect.
• Hobie1995 shuffled their deck.
  Hobie1995 played Genesect to the Bench.
  Hobie1995 attached Air Balloon to Genesect on the Bench.
  Hobie1995 played Fighting Gong.
• Hobie1995 drew Makuhita.
• Hobie1995 shuffled their deck.
  Hobie1995 played Makuhita to the Bench.
  Hobie1995 attached Basic Fighting Energy to Solrock in the Active Spot.
  Hobie1995's Solrock used Cosmic Beam on WaserAdept’s Moltres for 70 damage.

WaserAdept's Turn
WaserAdept drew Dreepy.
WaserAdept played Dreepy to the Bench.
WaserAdept played Lillie's Determination.

• WaserAdept shuffled 5 cards into their deck.
  • Crispin, Basic Darkness Energy, Shaymin, Dragapult ex, Drakloak
• WaserAdept drew 8 cards.
  • Munkidori, Yveltal, Basic Darkness Energy, Buddy-Buddy Poffin, Poké Pad, Dreepy, Dreepy, Buddy-Buddy Poffin
  WaserAdept played Buddy-Buddy Poffin.
• WaserAdept drew Budew and played it to the Bench.
• WaserAdept shuffled their deck.
  WaserAdept played Dreepy to the Bench.
  WaserAdept played Dreepy to the Bench.
  WaserAdept played Munkidori to the Bench.
  WaserAdept attached Basic Darkness Energy to Munkidori on the Bench.
  WaserAdept retreated Moltres to the Bench.
• Basic Darkness Energy was discarded from WaserAdept's Moltres.
  WaserAdept's Budew is now in the Active Spot.
  WaserAdept's Munkidori used Adrena-Brain.
• WaserAdept moved 3 damage counters from WaserAdept's Moltres to WaserAdept's Riolu.
  WaserAdept's Budew used Itchy Pollen on Hobie1995’s Solrock for 20 damage. Hobie1995's Solrock took 10 more damage because of Grass Weakness.
• Damage breakdown:
  • Base damage: 10 damage
  • Weakness to Grass: 10 damage
  • Total damage: 20 damage

Hobie1995's Turn
Hobie1995 drew a card.
Hobie1995's Lunatone used Lunar Cycle.

• Hobie1995 discarded Basic Fighting Energy.
• Hobie1995 drew 3 cards.
  Hobie1995 played Morty's Conviction.
• Hobie1995 discarded Judge.
• Hobie1995 drew 5 cards.
  Hobie1995's Solrock used Cosmic Beam on WaserAdept’s Budew for 70 damage.
  WaserAdept's Budew was Knocked Out!
  Hobie1995 took a Prize card.
  A card was added to Hobie1995's hand.
  WaserAdept's Moltres is now in the Active Spot.

WaserAdept's Turn
WaserAdept drew Munkidori.
WaserAdept played Poké Pad.

• WaserAdept drew Drakloak.
• WaserAdept shuffled their deck.
  WaserAdept evolved Dreepy to Drakloak on the Bench.
  WaserAdept's Drakloak used Recon Directive.
• WaserAdept drew Boss's Orders.
  WaserAdept played Boss's Orders.
• Hobie1995's Makuhita was switched with Hobie1995's Solrock to become the Active Pokémon.
  Hobie1995's Makuhita is now in the Active Spot.
  WaserAdept's Munkidori used Adrena-Brain.
• WaserAdept moved 3 damage counters from WaserAdept's Moltres to WaserAdept's Riolu.
  WaserAdept played Buddy-Buddy Poffin.
• WaserAdept shuffled their deck.
  WaserAdept ended their turn.

Hobie1995's Turn
Hobie1995 drew a card.
Hobie1995 attached Air Balloon to Makuhita in the Active Spot.
Hobie1995 played Fighting Gong.

• Hobie1995 drew Basic Fighting Energy.
• Hobie1995 shuffled their deck.
  Hobie1995's Lunatone used Lunar Cycle.
• Hobie1995 discarded Basic Fighting Energy.
• Hobie1995 drew 3 cards.
  Hobie1995 played Fighting Gong.
• Hobie1995 drew Basic Fighting Energy.
• Hobie1995 shuffled their deck.
  Hobie1995 attached Basic Fighting Energy to Riolu on the Bench.
  Hobie1995 played Ultra Ball.
• Hobie1995 discarded 2 cards.
  • Tool Scrapper, Lillie's Determination
• Hobie1995 drew Mega Lucario ex.
• Hobie1995 shuffled their deck.
  Hobie1995 evolved Riolu to Mega Lucario ex on the Bench.
  Hobie1995 retreated Makuhita to the Bench.
  Hobie1995's Mega Lucario ex is now in the Active Spot.
  Hobie1995's Mega Lucario ex used Aura Jab on WaserAdept’s Moltres for 130 damage.
• Hobie1995 attached Basic Fighting Energy to Makuhita on the Bench.
• Hobie1995 attached Basic Fighting Energy to Makuhita on the Bench.
• Hobie1995 attached Basic Fighting Energy to Makuhita on the Bench.
  WaserAdept's Moltres was Knocked Out!
  Hobie1995 took a Prize card.
  A card was added to Hobie1995's hand.
  WaserAdept's Dreepy is now in the Active Spot.

WaserAdept's Turn
WaserAdept drew Drakloak.
WaserAdept's Drakloak used Recon Directive.

• WaserAdept drew Poké Pad.
  WaserAdept evolved Dreepy to Drakloak on the Bench.
  WaserAdept played Poké Pad.
• WaserAdept drew Drakloak.
• WaserAdept shuffled their deck.
  WaserAdept evolved Dreepy to Drakloak in the Active Spot.
  WaserAdept played Yveltal to the Bench.
  WaserAdept's Drakloak used Recon Directive.
• WaserAdept drew Area Zero Underdepths.
  WaserAdept's Drakloak used Recon Directive.
• WaserAdept drew Ultra Ball.
  WaserAdept ended their turn.

Hobie1995's Turn
Hobie1995 drew a card.
Hobie1995's Lunatone used Lunar Cycle.

• Hobie1995 discarded Basic Fighting Energy.
• Hobie1995 drew 3 cards.
  Hobie1995 played Poké Pad.
• Hobie1995 drew Hariyama.
• Hobie1995 shuffled their deck.
  Hobie1995's Mega Lucario ex used Aura Jab on WaserAdept’s Drakloak for 130 damage.
• Hobie1995 attached Basic Fighting Energy to Lunatone on the Bench.
  WaserAdept's Drakloak was Knocked Out!
  Dreepy was discarded from WaserAdept's Drakloak.
  Hobie1995 took a Prize card.
  A card was added to Hobie1995's hand.
  WaserAdept's Yveltal is now in the Active Spot.

WaserAdept's Turn
WaserAdept drew Basic Darkness Energy.
WaserAdept's Drakloak used Recon Directive.

• WaserAdept drew Risky Ruins.
  WaserAdept's Drakloak used Recon Directive.
• WaserAdept drew Lillie's Determination.
  WaserAdept attached Basic Darkness Energy to Yveltal in the Active Spot.
  WaserAdept played Ultra Ball.
• WaserAdept discarded 2 cards.
  • Munkidori, Risky Ruins
• WaserAdept drew Fezandipiti ex.
• WaserAdept shuffled their deck.
  WaserAdept played Fezandipiti ex to the Bench.
  WaserAdept played Lillie's Determination.
• WaserAdept shuffled Area Zero Underdepths into their deck.
• WaserAdept drew 8 cards.
  • Drakloak, Team Rocket's Petrel, Dragapult ex, Unfair Stamp, Buddy-Buddy Poffin, Area Zero Underdepths, Boss's Orders, Dragapult ex
  WaserAdept's Fezandipiti ex used Flip the Script.
• WaserAdept drew 3 cards.
  • Area Zero Underdepths, Basic Fire Energy, Buddy-Buddy Poffin
  WaserAdept's Yveltal used Clutch on Hobie1995’s Mega Lucario ex for 20 damage.

Hobie1995's Turn
Hobie1995 drew a card.
Hobie1995 evolved Makuhita to Hariyama on the Bench.
Hobie1995's Hariyama used Heave-Ho Catcher.

• WaserAdept's Fezandipiti ex was switched with WaserAdept's Yveltal to become the Active Pokémon.
  WaserAdept's Fezandipiti ex is now in the Active Spot.
  Hobie1995 played Judge.
• Hobie1995 shuffled 11 cards into their deck.
• Hobie1995 shuffled 11 cards into their deck.
  • Drakloak, Team Rocket's Petrel, Dragapult ex, Unfair Stamp, Buddy-Buddy Poffin, Area Zero Underdepths, Boss's Orders, Dragapult ex, Area Zero Underdepths, Basic Fire Energy, Buddy-Buddy Poffin
• Hobie1995 drew 4 cards.
• Hobie1995 drew 4 cards.
  • Buddy-Buddy Poffin, Basic Psychic Energy, Ultra Ball, Area Zero Underdepths
  Hobie1995's Mega Lucario ex used Aura Jab on WaserAdept’s Fezandipiti ex for 260 damage. WaserAdept's Fezandipiti ex took 130 more damage because of Fighting Weakness.
• Damage breakdown:
  • Base damage: 130 damage
  • Weakness to Fighting: 130 damage
  • Total damage: 260 damage

WaserAdept's Fezandipiti ex was Knocked Out!
Hobie1995 took 2 Prize cards.
A card was added to Hobie1995's hand.
A card was added to Hobie1995's hand.
WaserAdept's Yveltal is now in the Active Spot.

WaserAdept's Turn
WaserAdept drew Brock's Scouting.
WaserAdept played Ultra Ball.

• WaserAdept discarded 2 cards.
  • Brock's Scouting, Buddy-Buddy Poffin
• WaserAdept drew Dragapult ex.
• WaserAdept shuffled their deck.
  WaserAdept's Drakloak used Recon Directive.
• WaserAdept drew Night Stretcher.
  WaserAdept's Drakloak used Recon Directive.
• WaserAdept drew Team Rocket's Petrel.
  WaserAdept evolved Drakloak to Dragapult ex on the Bench.
  WaserAdept attached Basic Psychic Energy to Dragapult ex on the Bench.
  WaserAdept played Team Rocket's Petrel.
• WaserAdept drew Unfair Stamp.
• WaserAdept shuffled their deck.
  You conceded. Hobie1995 wins.