Siege Striker
Creature — Human Soldier
Double strike (This creature deals both first-strike and regular combat damage.)
Whenever Siege Striker attacks, you may tap any number of untapped creatures you control. Siege Striker gets +1/+1 until end of turn for each creature tapped this way.
イラスト：
Core Set 2021#37アンコモン英語適正
裁定
You choose how many and which creatures to tap while Siege Striker’s ability is resolving. No player may take other actions between the time you make this choice and the time Siege Striker’s power and toughness are raised.
If an attacking creature with vigilance is tapped for Siege Striker’s ability, that creature remains an attacking creature.
If Siege Striker gains vigilance and attacks or attacks and becomes untapped before its last ability resolves, it can be tapped for its own ability.
Once Siege Striker’s ability has resolved, it keeps the power-and-toughness bonus even if some of the tapped creatures leave the battlefield or become untapped.