Underworld Cerberus

The middle clause is the whole thesis: while this dog stands on the battlefield, no card sitting in any graveyard can be targeted by a spell or ability. Reanimation that reaches into a yard, effects that pin a specific card in the bin, recursion that fishes one body back: all of it goes dead, because the target it wants is no longer legal. A black-red deck fields a 6/6 that walls off the very interaction such decks most fear from across the table, then hands the game a symmetrical clock. The evasion profile keeps the pressure honest: demanding three blockers makes it functionally unblockable against most boards, so it is usually swinging, usually getting chumped or traded into, and usually setting off its death trigger on its own terms. That trigger is the design's balancing act. It fires only on death (bounce it or exile it another way and nothing comes back), and when it fires, every player takes back all creature cards from their own graveyard, into hand rather than onto the battlefield. It is a great symmetrical un-burial that returns your opponents' dead alongside your own, and it returns creatures only, leaving instants, sorceries, and everything else exactly where they lay. The payoff is a refill you have to recast, so winning the exchange means arriving with the deeper creature count or the faster follow-up. A finisher that shields the graveyard from interaction while it lives, then floods every hand with creatures the moment it falls.