Dragonlord Atarka

An eight-power flier with trample is already a clock, but the design charges twice for that body: the enters trigger is a Flame Slash and an Arc Lightning rolled together, five damage spread however you like across the opposing board the moment it lands. That split-damage clause is what separates this from the rest of its color pair's haymakers. Most green-red top-ends ask you to attack into a defended board; this one clears the defenders on the way down, divided across any number of creatures or planeswalkers, so a wall of small blockers and a flooded battlefield are equally vulnerable. The damage is the tempo swing and the body is the payoff, arriving in the same cast. That power buys you nothing in protection, though: seven mana and no haste means it does not defend itself, it does not draw a card, and it leaves you exposed the turn it resolves if your opponent has reach. Of the cycle of two-color Elder Dragon rulers, this is the one that reads as pure punishment, a finisher that removes the board itself rather than a value engine. The trigger cannot touch life totals (it only burns creatures and planeswalkers), so the reward is positional rather than direct: ramp hard enough to land it early and the five free points clear the opposing board, leaving eight evasive power to start mopping up the next turn.