Moira and Teshar
The engine hiding inside a two-color legend that reads, from its keyword line, like a fair flier. The trigger is the entire card: casting anything historic (an artifact, a legendary, or a Saga) reanimates a nonland permanent from your graveyard, gives it haste, and reclaims it once the turn ends. Read the fine print and it turns meaner than a value loop. The reanimated card cannot leave by any other route: sacrifice, bounce, death, all get redirected into exile. That clause is what makes Moira and Teshar less a recursion effect than a machine for firing enters-the-battlefield triggers on demand. Because the permanent never actually reaches the graveyard on its way out, "dies" abilities do not fire off the exile: what you are farming is the front half of the loop, the enters trigger and whatever activated or attack value the creature offers during its one hasty turn, collected without ever risking the card to removal down the line. Historic is such a wide net that most artifact-and-legend shells are casting a triggering spell every turn without arranging to, so the ability recurs as a matter of course rather than as something you have to assemble. The 4/5 flying body is nearly incidental: enough to attack and block, but the point is the recurring one-shot reanimation that a whole deck of blink-adjacent triggers can be built to exploit.
