Rakdos Pit Dragon

Hellbent is the rare mechanic that asks an aggressive deck to do the thing aggressive decks already want to do: empty the hand. That alignment is what makes this Dragon click. The double strike clause only switches on when you hold no cards, which is precisely the board state a red beatdown deck reaches by the midgame anyway, and once it does, every point of damage gets doubled. The design tension here is between the body and the payoff. A 3/3 for four is a soft rate on its own, but the firebreathing and the flying activation are always live regardless of hand size, so the creature is never inert: in the early turns it is a beater that can pump and bash through the air, and the abilities cost only red, meaning a topdeck-only late game converts directly into reach. Hellbent is the multiplier layered on top. The card rewards a deck that treats its cards as ammunition to be spent rather than resources to hoard, which is a sharper deckbuilding ask than it looks: you have to be willing to run yourself out of gas to unlock the creature's best mode, and the firebreathing wants extra mana you would rather be spending elsewhere. Commit fully to the empty-hand plan, dump the red into pumps and flying, and the doubled total turns a modest Dragon into a clock that closes faster than its printed numbers suggest.