Criatura — Guerrero ogro
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Cuando el Ogro desafiante entre al campo de batalla, elige uno:
• Pon un contador +1/+1 sobre el Ogro desafiante.
• Destruye el artefacto objetivo.
You choose which mode you're using as you put the ability on the stack, after the creature has entered the battlefield. Once you've chosen a mode, you can't change that mode even if the creature leaves the battlefield in response to that ability.
If a mode requires a target and there are no legal targets available, that mode can't be chosen. You must choose another mode if able.