Apocalypse Hydra

The double-counter clause is the whole mechanical statement here: an X-spell hydra that pays out linearly until X hits five, then bends the curve upward and doubles its return on every point past that threshold. That breakpoint is the design hook. Most variable-cost creatures scale smoothly, so the body you get is a clean function of the mana you spent; this one has a kink in the line that rewards committing big rather than spreading the investment across smaller casts. The second ability is what keeps the counters from being a dead stat sheet at any size: every counter is a stored point of damage you can fling at any target for , so even a modest cast arrives as a small pile of stats that doubles as a slow burn engine, and a large one becomes a fully loaded artillery battery. The same investment that grows the body also loads a clip you can spend down to clear blockers, pick off planeswalkers, or convert a stalled board into a finisher. The tension is that every shot shrinks the thing doing the shooting, which makes a fully grown Apocalypse Hydra a one-creature attrition engine that decides for itself whether it wants to be a beater or a removal suite. It is the kind of build-around that asks for a lot of mana up front and then keeps asking what you want to spend it on.