Basking Broodscale + Cathars' Crusade + Yuna, Grand Summoner

Basking Broodscale

Cathars' Crusade

Yuna, Grand Summoner

How it works

1. Cast Basking Broodscale by paying 1.
2. When Basking Broodscale enters, Cathars' Crusade triggers, putting a +1/+1 counter on Basking Broodscale.
3. Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token.
4. When the Eldrazi Spawn enters, Cathars' Crusade triggers, putting a +1/+1 counter on the Eldrazi Spawn.
5. Activate the Eldrazi Spawn by sacrificing it, adding C.
6. When the Eldrazi Spawn dies, Yuna triggers, putting a +1/+1 counter on Basking Broodscale.
7. Repeat from step 3.
8. Activate Basking Broodscale's adapt ability by paying 1, putting a +1/+1 counter on it.
9. Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token.
10. When the Eldrazi Spawn enters the battlefield, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control.
11. Repeat from step 2.