The Tenth Doctor + Mana Echoes + Venture Forth + Saheeli, Sublime Artificer
The Tenth Doctor
Mana Echoes
Venture Forth
Saheeli, Sublime Artificer
Infinite creature ETBInfinite colorless manaInfinite creature tokensInfinite magecraft triggersNear-infinite landfall triggersPut all lands from your library onto the battlefield
How it works
Activate The Tenth Doctor by paying 7, removing all time counters from Venture Forth.
Venture Forth triggers, causing you to cast it from exile without paying its mana cost.
Saheeli, Sublime Artificer triggers, creating a creature token.
When the creature token enters, Mana Echoes triggers, adding C for each creature you control that shares a creature type with the token.