The Tenth Doctor + Mana Echoes + Charnel Serenade + Sedgemoor Witch

The Tenth Doctor

Mana Echoes

Charnel Serenade

Sedgemoor Witch

How it works

1. Activate The Tenth Doctor by paying 7, removing all time counters from Charnel Serenade.
2. Charnel Serenade triggers, causing you to cast it from exile without paying its mana cost.
3. Sedgemoor Witch triggers, creating a creature token.
4. When the creature token enters, Mana Echoes triggers, adding C for each creature you control that shares a creature type with the token.
5. Resolve Charnel Serenade.
6. Repeat.

This fascinating recursive loop hinges on manipulating time counters and capitalizing on spell-casting triggers to generate an unstoppable cascade. By activating The Tenth Doctor's time travel ability, you strip the last time counter off an exiled Charnel Serenade, forcing it to be cast for free from exile. Casting this sorcery instantly fires off Sedgemoor Witch's magecraft ability to spawn a Pest token, which in turn fuels Mana Echoes to generate a surplus of colorless mana. Because Charnel Serenade naturally exiles itself with three new time counters whenever it resolves, you can simply funnel your newly generated mana right back into The Tenth Doctor to accelerate the process, surveil your entire library, and flood the board with your entire graveyard of creatures.