Woodcaller Automaton + Temur Sabertooth + Gaea's Cradle

Woodcaller Automaton

Temur Sabertooth

Gaea's Cradle

How it works

1. Activate Gaea's Cradle by tapping it, adding at least six .
2. Cast Woodcaller Automaton for its prototype cost by paying 2.
3. When Woodcaller Automaton enters, it triggers, causing Gaea's Cradle to become a creature and untapping it.
4. Activate Temur Sabertooth by paying 1, returning Woodcaller Automaton from the battlefield to your hand.
5. Repeat.

This loop relies on Gaea's Cradle producing a massive surge of green mana to fund a repeating cycle of casting and bouncing. You cast Woodcaller Automaton for its prototype cost, triggering its ability to turn Gaea's Cradle into a hasty Treefolk that untaps in the process. From there, you use Temur Sabertooth's activation to bounce Woodcaller Automaton right back to your hand, freeing you up to replay it and do it all over again while netting excess mana from the Cradle each iteration.