Obsidian Fireheart

The blaze counter is the design's whole pivot: it does not destroy or disable the land it marks, it conscripts that land into a permanent burn engine pointed at its controller. The parenthetical carries the strategic weight: once a counter goes down, it persists after the Fireheart leaves the battlefield, so each three-mana activation is a one-time outlay that keeps collecting on every future upkeep whether or not the body survives. That reframes the 4/4 as a delivery device rather than a finisher. Its real output is measured in upkeeps, not combat steps: pay the activation, mark a land, and the opponent absorbs a point per turn for as long as that counter stays, since the damage source is the burning land itself and not the Elemental that lit it. No amount of creature removal touches the clock once it is running. The cost structure is what keeps the engine from running away: the triple-red commitment and the per-counter tax mean lighting up a battlefield of lands is a serious investment that competes with everything else red wants to spend on at four mana and up. The result is a threat that does its killing slowly and indelibly, a creature whose lethal work outlives the creature, built for the grind where a single resolved Fireheart accumulates into a death sentence the opponent watches arrive one upkeep at a time.