The Tenth Doctor + Reality Strobe + Agatha of the Vile Cauldron + Urabrask // The Great Work

The Tenth Doctor

Reality Strobe

Agatha of the Vile Cauldron

Urabrask // The Great Work

How it works

1. Cast the noncreature permanent by paying 0.
2. Activate The Tenth Doctor by paying at most 1, removing three time counters from Reality Strobe.
3. Reality Strobe triggers, causing you to cast it from exile without paying its mana cost.
4. Urabrask triggers, dealing 1 damage to an opponent and adding .
5. Resolve Reality Strobe, returning Mana Vault from the battlefield to your hand, and then exiling Reality Strobe with three time counters on it.
6. Repeat.