Prosper, Tome-Bound + Goldspan Dragon + Flameskull + Yahenni, Undying Partisan + Doubling Season

Prosper, Tome-Bound

Goldspan Dragon

Flameskull

Yahenni, Undying Partisan

Doubling Season

How it works

1. Activate Yahenni by sacrificing Flameskull.
2. When Flameskull dies, it triggers, exiling it and the top card of your library with the ability to cast one from exile this turn.
3. Resolve the Yahenni ability.
4. Cast Flameskull from exile by paying 1.
5. Prosper's second ability triggers, creating two Treasure tokens.
6. Activate the Treasures by tapping and sacrificing them, adding 2.
7. Repeat.

This fiery loop turns the recursive nature of Flameskull into an engine of endless value, anchored by Yahenni, Undying Partisan as the dedicated sacrifice outlet. Whenever Flameskull meets its end, its own *Rejuvenation* triggers alongside the token-doubling might of Doubling Season, which amplifies the Treasure-crafting payoff from Prosper, Tome-Bound's *Pact Boon* whenever you cast it back out of exile. Meanwhile, Goldspan Dragon doubles the mana yield of every single Treasure you crack, ensuring you always net a profit of mana to keep casting Flameskull over and over again.