Skaab Ruinator

A 5/6 flyer for three mana is a body blue is not normally allowed to keep, and the way this design pays for that excess is the whole architecture: it does not cost mana, it costs your graveyard. Three creature cards exiled to cast it, then the freedom to recast from the yard after it dies. That tension is real. The recursion clause wants a stocked graveyard; the additional cost wants to strip-mine it. Every cast consumes three more bodies, so the card runs on a fuel line you have to keep refilling, and a shell that mills or self-mills aggressively is feeding two engines at once: the cost to cast and the recursion to bring it back. The trade it offers is a creature that shrugs off most spot removal (kill it and it returns, provided you can still feed it) in exchange for a deckbuilding commitment most blue decks cannot honor. Self-mill, looting, and reanimation packages were the obvious home, and this sat near the top of them as the payoff that rewarded filling the graveyard rather than emptying it onto the battlefield. The Horror typing and the additional-cost framing belong to a wave of designs built to make the graveyard a resource you spend rather than a pile you ignore; this one spends it twice.