Rampaging Raptor

The combat-damage trigger is what folds a dedicated planeswalker-answer into an aggressive creature: whatever damage lands on an opponent repeats onto a planeswalker they control or a battle they protect, so a single unblocked swing chips the pilot and dismantles the noncreature permanents behind them in one attack. The firebreathing feeds that loop directly. Pumping to a 6/4 or larger before combat scales the collateral in lockstep, so the activation is not just a way past a blocker but a way to double the reach of every point that connects. Haste lets the creature attack the turn it arrives, and trample refuses to let a chump blocker zero out the overflow that would otherwise carry through. Together they build a body that punishes the walkers and battles a controlling deck leans on without asking for a separate removal spell. The restraint is precise. The doubled damage only reaches those two permanent categories, and only when the creature actually connects; against a full board of blockers with nothing vulnerable on the far side, it collapses back into a 4/4 with an expensive pump and nowhere to send the extra.