Warfire Javelineer

The damage is bought with your graveyard, which means the body and the entry trigger are built for two decks pulling in the same direction. A four-mana 2/3 Minotaur is a thin rate on its own; the trigger asks you to be a spellslinger who has already burned through a stack of instants and sorceries before this hits the table. That tension is the whole pitch: the more you have leaned on cheap burn and cantrips, the larger the entry shot scales, until a creature that costs four mana arrives doing the work of a removal spell you have already cast several copies of. The restriction that keeps it grounded is that X reads your own graveyard, not the board state, so the count comes free to a deck that wanted those cards in the bin already rather than one straining to inflate it. The other quiet constraint is target choice: the damage must hit a creature an opponent controls, ruling out the reach-to-the-face finish that a free X-damage spell stapled to a body might otherwise enable. What you get instead is a midgame tempo swing that doubles as a body, a payoff for a graveyard you filled for other reasons, one more red creature whose enter-the-battlefield trigger tries to make a modest rate worth paying.