Prize Weirdness with Daisy's Help but Mainly Arc Phone
Daisy's Help
When played, Daisy's Help shows you your Prizes, but doesn't show you what position each Prize is in. Since Prizes should be returned to their original positions upon resolution of Daisy's Help, you actually gain less information from Daisy's Help than you should.
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Arc Phone
In a bot match, I played Arc Phone to manipulate my top card, while having 6 Prizes. The Prize counter then displayed 7, even though the Prize I chose should've gone on top of my deck. I did not have time to confirm this, because before I could draw it, the bot had a turn, played Iono, and the game froze. This happens every time an Iono is played after any number of Arc Phones and it doesn't matter who plays the Iono.
In a later bot match, I had 3 Prizes and played Arc Phone. After doing so, the Prize counter showed 4. Later, I played Daisy's Help and was shown 3 Prizes. This suggests that Arc Phone erroneously updates the counter without actually changing the number of Prizes. Taking a Prize card in this situation returns the counter to 3 and leaves behind a "ghost" Prize that is never interacted with. Playing multiple Arc Phones increases the counter further.
I then built a test deck (and only used it against bots, do not attempt this in live games against actual players) to confirm the consistency of the Arc Phone-Iono interaction and it does put the selected Prize on top of your deck where it belongs. However, what I then encountered was searches being completely broken. Cards became invisible and unselectable, even though a nonzero number of valid targets were indicated for the search. This is annoying but fine with searches that can be failed, but using unconditional search effects like Star Alchemy effectively become a near-softlock that can only be broken by conceding.
I will not release this list publicly because I don't want to give even the appearance of endorsing the use of these interactions to break the game. I'm just working on a Magcargo ex deck and using cards like Arc Phone to put Energies on the top of my deck and stumbled upon this while testing consistency changes. If a Live developer wants to use my list to replicate what I have experienced, I will provide it to them via PM.
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There are further questions to be had about similar effects, especially in Expanded, that I have not explored. Does N similarly lock the game because it too relies on the Prize counter? What about Nagandel-GX and its Injection-GX attack that actually adds to the Prize count, do these interactions also break the game? Do cards like Ultra Beasts not function correctly under an incorrect Prize counter? What about an opponent's Schoolboy/Schoolgirl? Are all of these questions rendered moot when and if Arc Phone is fixed? (Hopefully.)