Infernal Captor
Exploit (When this creature enters, you may sacrifice a creature.)
When this creature exploits a creature, gain control of target artifact or creature until end of turn. Untap that permanent. It gains haste until end of turn.
Possession is nine-tenths of the law. His fist is the other tenth.
Illustrated by Josu Hernaiz
This printing
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If the creature with exploit isn't on the battlefield as the exploit ability resolves, you won't get any bonus from the creature with exploit, even if you sacrifice a creature. Because the creature with exploit isn't on the battlefield, its other triggered ability won't trigger.
You choose whether to sacrifice a creature and which creature to sacrifice as the exploit ability resolves.
A creature with exploit "exploits a creature" when the controller of the exploit ability sacrifices a creature as that ability resolves.
You can target an artifact or creature you already control (including Infernal Captor) with Infernal Captor's last ability just to untap that permanent and give it haste.
You can sacrifice the creature with exploit if it's still on the battlefield. This will cause its other ability to trigger.
You can't sacrifice more than one creature to any one exploit ability.
