Liege of the Pit

The upkeep tax is the whole bargain: a 7/7 flier with trample that demands a creature sacrifice every turn or burns you for exactly its own power. This is the old Demon contract redrawn for a modern keyword soup. The lineage runs back to Lord of the Pit, the original "great body, fatal upkeep" Demon, and the math here is deliberately cruel: 7 damage is precisely what it takes to swing a game in your favor and precisely what it takes to kill you if your board runs dry. A reliable stream of fodder turns this beatstick into the top of a sacrifice engine rather than a standalone threat. Morph is what makes that contract survivable to deploy. Casting it face down as a 2/2 for sidesteps the upkeep clause entirely (a face-down creature has no abilities), so you can hold the Demon in reserve and flip it on the turn the sacrifice chain is ready, dodging the awkward window where it would otherwise eat your own life total. The trample matters because a 7/7 that has to feed itself wants to end games fast; chump blockers don't buy the opponent time. It is a creature built around the tension between a threat you badly want and an upkeep you have to plan an entire board around to afford.