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When a monster effect is activated (Quick Effect): Tribute this face-up card

Yuri played his dragon in his Pendulum Zone, due to its effect

When DNA digivolving, you may search your security stack for 1 level 5 or lower Digimon card and play it without paying its memory cost

Polymerization A deck with Elemental Heroes simply cannot work without Polymerization

when Yugi or his friends are in danger, he emerges from the Puzzle and takes over Yugi's body to protect them, challenging his opponents to Shadow Games and giving them a Penalty Game as punishment after defeating them or if they cheat

For most Fusion Substitute Monsters, the effect that allows Fusion Substitute Monsters to replace a Fusion Material is unclassified