That's 10! (The Infinite Forbidden INFO-EN067) - Common Yu-Gi-Oh! Card

Each time a card or effect is activated, except "That's 10!": You can place 1 Access Counter on this card (max. 10). Monsters you control gain 100 ATK for each Access Counter on this card. If the 10th Access Counter is placed on this card: You can return this card to the hand, and if you do, Set from your Deck, 1 Continuous Trap with an effect that Special Summons itself as a monster. It can be activated this turn.