The Twelfth Doctor + Increasing Vengeance

The Twelfth Doctor

Increasing Vengeance

How it works

1. Cast the instant or sorcery spell from your hand by paying its mana cost.
2. Holding priority, cast Increasing Vengeance from your graveyard for its flashback cost by paying 3, targeting the instant or sorcery.
3. Increasing Vengeance's demonstrate ability triggers, causing you and an opponent to copy Increasing Vengeance, with your copy targeting the original Increasing Vengeance.
4. The Twelfth Doctor triggers, putting a +1/+1 counter on it.
5. Resolve the copy of Increasing Vengeance, copying Increasing Vengeance, with the copy targeting the original Increasing Vengeance.
6. Repeat from step 4.

This loop harnesses The Twelfth Doctor's static grant of demonstrate to pull off a recursive copy chain entirely from the graveyard. Because Increasing Vengeance is cast from the graveyard via its flashback cost, The Twelfth Doctor sees it as a spell cast from anywhere other than your hand and automatically gives it demonstrate, allowing you to copy it. By using those demonstrate and copy triggers to target Increasing Vengeance itself over and over, you can continuously grow The Twelfth Doctor with infinite +1/+1 counters and trigger any magecraft effects infinitely.