Emiel the Blessed + Arcbound Shikari + Crystalline Crawler + Cathars' Crusade + Conclave Mentor

Emiel the Blessed

Arcbound Shikari

Crystalline Crawler

Cathars' Crusade

Conclave Mentor

How it works

1. Activate Emiel the Blessed by paying 3, blinking Arcbound Shikari.
2. When Arcbound Shikari enters the battlefield, it and Cathars' Crusade trigger.
3. Resolve the Arcbound Shikari trigger, putting two +1/+1 counters on each other artifact creature you control.
4. Resolve the Cathars' Crusade trigger, putting two +1/+1 counters on each creature you control.
5. Activate Crystalline Crawler's first ability three times by removing three +1/+1 counters from it, adding 3.
6. Repeat.