The Fugitive Doctor

The rare Doctor built entirely around spellslinging rather than the Companion structure that anchors most of its cycle. The engine has three moving parts that have to line up: the enters trigger banks a Clue, the attack trigger offers to spend that Clue, and the reflexive payoff is granting flashback to an instant or sorcery already sitting in your graveyard. That recursion clause is where the design earns its keep. Rather than churning cards from hand or drawing off the Clue, this Doctor turns combat into a recursion outlet for spells you have already cast, which means the deck it wants is one that expects to trade burn and utility away early and buy it back on the swing. The flashback cost is a flat Gruul price stapled onto whatever you retarget, so a one-mana bolt-style spell and a four-mana sweeper cost the same to rebuy: the value scales with what you have discarded or spent, not with the card's own rate. The sacrifice is optional, and the target is chosen when the reflexive "when you do" trigger goes on the stack, after the Clue is already gone, so you commit the Clue before you name the spell, and if that target leaves the graveyard first the Clue is simply spent for nothing. A slower, combat-gated take on the graveyard-recursion axis Gruul rarely gets to play in, with a 4/4 body doing enough to justify attacking into open mana while the real work happens on the trigger.