Bishop of Binding
Most temporary-exile creatures stop at the removal: hit the battlefield, pocket the best blocker, leave the door open for a swing. This one turns the prisoner into a recurring resource. The exiled creature's power sets X, and whenever the Bishop attacks, that X feeds into any Vampire you choose, whether or not that Vampire is in the attack. The pump is not tied to the moment of exile and it is not automatic every combat: it fires only when the one-toughness Cleric declares as an attacker, so keeping the engine running means committing a fragile body to combat turn after turn. That second clause reframes how you read the board. A fat creature is not just a threat to neutralize; once bound, its power becomes a battery you can pour into whichever Vampire is best positioned to use it, so the bigger the thing you eat, the bigger the boost on tap. The balancing lever is the 1/1 itself: kill the Bishop and the exiled creature comes home, the pump stream dries up, and a single removal spell unwinds both halves of the card at once. Nothing here is owned, only rented against a body anyone can trade with, which is the tax on an otherwise open-ended enchantment-in-creature-form design. The vampiric flavor tracks cleanly: the larger the creature it sinks its teeth into, the larger the surge it siphons off, so long as the host survives to attack.
