Sidisi, Undead Vizier
Legendary Creature — Zombie Snake
Deathtouch
Exploit (When this creature enters, you may sacrifice a creature.)
When Sidisi exploits a creature, you may search your library for a card, put it into your hand, then shuffle.
Min Yum
Dragons of Tarkir Promos (PDTK)
• #120pRulings
You can sacrifice the creature with exploit if it's still on the battlefield. This will cause its other ability to trigger.
(wotc • 2015-02-25)
You choose whether to sacrifice a creature and which creature to sacrifice as the exploit ability resolves.
(wotc • 2015-02-25)
A creature with exploit "exploits a creature" when the controller of the exploit ability sacrifices a creature as that ability resolves.
(wotc • 2015-02-25)
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.
(wotc • 2015-02-25)
You can't sacrifice more than one creature to any one exploit ability.
(wotc • 2015-02-25)
Rulings
You can sacrifice the creature with exploit if it's still on the battlefield. This will cause its other ability to trigger.
(wotc • 2015-02-25)
You choose whether to sacrifice a creature and which creature to sacrifice as the exploit ability resolves.
(wotc • 2015-02-25)
A creature with exploit "exploits a creature" when the controller of the exploit ability sacrifices a creature as that ability resolves.
(wotc • 2015-02-25)
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.
(wotc • 2015-02-25)
You can't sacrifice more than one creature to any one exploit ability.
(wotc • 2015-02-25)