Drownyard Amalgam

Six toughness on a five-mana body is the tell: this is a wall first, built for the color that would rather stall the ground than race it. The three-card mill when it enters is a one-time nudge, a token gesture toward a self-mill graveyard plan or a small dent in an opponent's library, and once the creature is on the battlefield that trigger is spent. What earns the card its slot is the durability. A 3/6 stonewalls the aggressive creatures that punish blue for playing slowly, holding the fort while a longer-game engine assembles. The evasion clause is the off-ramp: the same body that was blocking can spend two mana and a blue to become unblockable, converting a defensive wall into an offensive clock once the board clogs up. That is the honest split. It defends until the plan matures, then it attacks to close. The Zombie Horror sits in that graveyard-value space by design: a creature you can trust to survive to the turn your payoff arrives, carrying a modest chunk of mill as it lands and a way to turn sideways when the game asks it to.