Exploit

Exploit is a keyword ability introduced in Dragons of Tarkir, where it is the signature ability of the blue-black Clan Silumgar.

Description
When a creature with exploit enters the battlefield, the player may sacrifice a creature. Each creature with exploit has another ability that gives the player a benefit when it "exploits a creature" This means when the player sacrificed a creature because of its exploit ability.

Exploit also appeared in Modern Horizons.

Rulings

 * 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.
 * You can't sacrifice more than one creature to any one exploit ability.
 * The extra ability doesn't trigger if the player sacrificed a creature for any other reason, including the exploit ability of a different creature.
 * A player can sacrifice any creature they control when the exploit ability resolves, including the creature with exploit itself.
 * You don't have to sacrifice a creature if you don't want to.