returning player, why are all my old cards banned?

i havent played this tcg game yet i used to play the old one and quit when they shut down the old version. i understand why i dont have my old decks but why dont i have my old cards? it says theyre banned???
Answers
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Set rotation, it's what every TCG does. Right now only cards with an "F", "G" or "H" are play-legal. Unlimited format events let you play with whatever you have, however.
Also, keep in mind, as of April 4th only "G" and "H" cards will be legal, as F-cards are being rotated out.0 -
Like in the old game and irl, this game also has the Standard format rotation, so every year many cards rotate out of the Standard format meaning you can't play those rotated cards anymore in Standard.
You can still play most of the avaiable cards in other formats like Expanded (have in mind this format isn't fully supported yet).
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