Exuberant Firestoker

Two effects share one body, and the trick is that they never fight each other for it. Tap the 1/1 for colorless on your main phase to accelerate toward a heavy threat, and the end-step damage still fires regardless of whether the creature is tapped: the check only asks whether you control something with power 5 or greater, not whether your Druid is available to deal it. So the same turn ramps you toward the payoff and then collects on it, a recurring 2 to a player or planeswalker that compounds into a clock once the board state cooperates. The damage skips creatures entirely, which makes this reach and inevitability rather than removal: it punishes a stalled board and finishes games already leaning your way, but it never trades or blocks for you. The 1/1 frame is where the fragility lives. It cannot protect itself or the large creature it depends on, so the engine runs exactly as long as your battlefield keeps something sizable alive. In a deck full of fat, the end step turns into a death sentence collected in installments; against repeated sweepers, it is a do-nothing that taps for one. The design is honest about the bargain: cheap acceleration up front, with the second ability functioning as deferred interest you only earn if you actually land the threats the first ability was built to find.