MAGIC: THE GATHERING
|Type:||Creature - Human Pirate|
When Hostage Taker enters the battlefield, exile another target artifact or creature until Hostage Taker leaves the battlefield. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any type to cast that spell.
Hostage Taker doesn't just steal your opponents' creatures - it allows you to cast them, so you can benefit from their "enter the battlefield" effects.