Requires

Isochron Scepter must be on the battlefield. The Blackstaff of Waterdeep must be on the battlefield. Call to Glory must be in exile (exiled by Isochron Scepter). Creatures you control can tap to produce at least . Mana needed:

Steps

1. Activate all mana-producing creatures you control by tapping them, adding at least .
2. Activate The Blackstaff of Waterdeep by paying and tapping it, causing Isochron Scepter to become a 4/4 artifact creature.
3. Activate Isochron Scepter by paying and tapping it, casting a copy of Call to Glory without paying its mana cost.
4. Resolve Call to Glory, untapping all creatures you control.
5. Activate all mana-producing creatures you control by tapping them, adding at least .
6. Repeat from step 3.

Results