Rubble Rouser

Every activation of the tap ability spends a card from your graveyard forever, which is the whole shape of this thing: not a loop but a countdown. Discard-to-draw on arrival seeds the yard it will later strip-mine, so the card fuels its own outlet the moment it lands, and the 1/4 defensive frame lets it sit behind blockers while the engine does its slow work. What it actually converts a full graveyard into is red mana plus a ping to each opponent per activation, so the damage output is bounded strictly by how much of your yard you are willing to burn down. That exile clause forces a real weighing at each activation: is this specific card worth more as mana-and-a-ping now, or as something you might recur later? A build that manufactures disposable cards faster than it needs them turns the pinger into a genuine clock; a hand that wants its graveyard intact gets almost nothing. The design sits in the lineage of graveyard-as-fuel outlets that also chip away at life totals, but relocated from the aristocrats' corner of black into red's sorcerer slice, where the burn trigger reads less as sacrifice payoff and more as a spark thrown off every time you cash a spent card for mana.