Wildgrowth Archaic + Crystalline Crawler + Temur Sabertooth

Wildgrowth Archaic

Crystalline Crawler

Temur Sabertooth

How it works

1. Cast Crystalline Crawler by paying 4 in four different colors of mana.
2. Wildgrowth Archaic triggers, causing Crystalline Crawler to enter with four +1/+1 counters on it. It'll enter with a total of eight counters due to its converge ability.
3. Activate Crystalline Crawler seven times by removing seven +1/+1 counters from it, adding 2.
4. Activate Temur Sabertooth by paying 1, returning Crystalline Crawler from the battlefield to your hand.
5. Repeat.