Mardu Blazebringer

An overstatted body for its cost, and the self-sacrifice clause is the bill it pays for that rate. The detail that gives it teeth is the trigger condition: the sacrifice fires when the Ogre attacks or blocks, not when it merely sits in play. That makes it a body priced to commit. As long as it stays out of combat it holds the board as a 4/4 deterrent, but the moment it swings or steps in front of an attacker, the clock starts and the creature leaves at end of combat. So combat is not free here the way it is for an ordinary beater; every block is a one-time trade, every attack a one-shot four damage that the controller spends rather than keeps. The reward this design dangles lives in the seam between attack-or-block declaration and that end-of-combat sacrifice: anything you can extract before the body goes (a pump effect, a death payoff off the sacrifice, a flicker to reset the doomed clock) turns a planned loss into value. Stripped of that scaffolding it is a deliberately blunt aggressive tool, built so the cheap rate and the scheduled self-destruction are two halves of one bargain.