credit card envelopes sleeve RFID Blocking Sleeves - Orchid Paisley Orchid Paisley This collection comes as an eight 16 Pack Social Security Card

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It would be a shame to see passionate indie devs making games in good faith to be overly constrained because, honestly, the games on this list are downright delightful

The short answer is that it isnt very useful at all

(3) Once per turn, during the End Phase, if the previous effect was activated this turn: Return this card to the Extra Deck, and if you do, Special Summon 1 "Salamance, Soaring Sky Tyrant" or "Paradox Roaring Moon" from your Extra Deck, GY, or banishment

Maybe its become too powerful and needs a ban

Overall I like the idea, and think you did it nicely keeping fairly in-theme