Requires

Prosper, Tome-Bound must be on the battlefield. Portcullis must be on the battlefield. Eternal Scourge must be in hand, or in exile. Planar Gate must be on the battlefield. Mana needed: plus an additional available if Eternal Scourge is in hand

Steps

1. Cast Eternal Scourge either from your hand or from exile by paying .
2. If you played Eternal Scourge from exile, Prosper's second ability triggers, creating a Treasure token.
3. Eternal Scourge enters the battlefield, triggering Portcullis, exiling Eternal Scourge.
4. If you created a Treasure token, activate it by tapping and sacrificing it, adding .
5. Repeat.

Results