legendary duelists soulburning volcano booster box Duelists: Pack Any Deck that uses FIRE Warriors and can assemble 2 Level 4 monsters can unleash a powerful new “Battlin’ Boxer” Xyz Monster that can add any FIRE Warrior from your Deck to your hand Yugioh Legendary Duelists: Soulburning |

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It has the following rules text: You may cast this spell for N if you also return an unblocked attacker you control to hand during the declare blockers step. If the sneak card being cast is a creature, it also has the text that it enters tapped and attacking. The particular time window means that once blockers are assigned but before the damage step, you can cast a sneak card

The wizards stamp is also a problem like you mentioned

The death of the first rat will trigger Thornbite Staff's ability and untap Marrow-Gnawer, letting you then do to it again to make three more rats

Ascended showed variance