Furyborn Hellkite

Bloodthirst was always a tempo bargain stapled to a body, and most of the keyword's bearers paid the discount in small denominations: a 2/2 that becomes a 3/3, a goblin that grows by one. This Dragon takes the mechanic to its loudest possible reading. Connect with anything earlier in the turn, even a single point of damage, and a 6/6 flier resolves as a 12/12. The math is what makes it a finisher rather than a midrange threat: bloodthirst 6 is the largest the keyword ever scaled to, and on a flying body it converts a chip of opening damage into a clock that ends the game in two swings. The tension is in the sequencing. Resolve it before anyone has taken damage and you are left with a fine seven-mana 6/6 flier, the kind of threat a topdeck can stabilize against. Resolve it after an attack step, a burn spell, or a smaller creature has already drawn blood, and you have spent that early aggression to double your payoff at the back end. It rewards a deck built to go wide early and tall late, where the first half of the game exists to turn the trigger on. That is the whole design: a haymaker that asks you to have been the aggressor before you ever cast it.