Zidane, Tantalus Thief

Threaten effects have always carried a built-in tax: you borrow a creature, swing for the fences, and hand it back at end of turn, at which point the opponent untaps it on their turn and points it right back at you. The first ability is the familiar Boros steal-and-alpha-strike package (untap, haste, and lifelink stapled on to convert the borrowed body into life you keep), but it is the second ability that reframes what stealing means for this color pair. Historically, Threaten decks leaned on sacrifice outlets to keep the creature past end of turn; this design goes the opposite way. Losing control of a permanent is the payout, not the penalty. When an opponent gains control of a permanent from you, you create a Treasure, and that trigger keys purely on the change of control, so it fires when the borrowed creature reverts at end of turn regardless of who owns it. That covers the ordinary case, and it opens a stranger one most steal cards never touch: deliberate donation, where handing an opponent a permanent you own turns your own generosity into ramp and fixing. The two halves point at slightly different builds, but both orbit the same insight, that control of a permanent is a resource that can be spent, seized, and taxed. For a five-mana 3/3, the body is nearly incidental; this is a card about who holds what, and how to get paid every time that changes.