Sidisi's Faithful
Creature — Snake Wizard
Exploit (When this creature enters the battlefield, you may sacrifice a creature.)
When Sidisi's Faithful exploits a creature, return target creature to its owner's hand.
"I tire of your prattle, and your face."
イラスト：
Dragons of Tarkir#74コモン英語適正
裁定
You can’t sacrifice more than one creature to any one exploit ability.
A creature with exploit “exploits a creature” when the controller of the exploit ability sacrifices a creature as that ability resolves.
You choose whether to sacrifice a creature and which creature to sacrifice as the exploit ability resolves.
You can sacrifice the creature with exploit if it’s still on the battlefield. This will cause its other ability to trigger.
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.