The Tenth Doctor + Mana Echoes + Venture Forth + Young Pyromancer

The Tenth Doctor

Mana Echoes

Venture Forth

Young Pyromancer

How it works

1. Activate The Tenth Doctor by paying 7, removing all time counters from Venture Forth.
2. Venture Forth triggers, causing you to cast it from exile without paying its mana cost.
3. Young Pyromancer 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 Venture Forth.
6. Repeat.

This ingenious loop turns time travel into an infinite mana and storm engine by exploiting the synergy between The Tenth Doctor and Venture Forth's suspend mechanic. Once The Tenth Doctor's {7} ability strips the final counters off a suspended Venture Forth, you cast it for free, which immediately prompts Young Pyromancer to churn out an Elemental token. That token's entry triggers Mana Echoes, generating a massive surge of colorless mana thanks to your growing horde of tokens and creatures, which easily funds the next activation of The Tenth Doctor's Timey-Wimey ability to repeat the process.