Cloudstone Curio + Deranged Hermit + Mana Echoes + Chromatic Orrery

Cloudstone Curio

Deranged Hermit

Mana Echoes

Chromatic Orrery

How it works

1. Activate Chromatic Orrery's first ability by tapping it, adding 5.
2. Cast Deranged Hermit by paying 5.
3. Deranged Hermit enters the battlefield, triggering itself, Cloudstone Curio, and Mana Echoes.
4. Resolve the Cloudstone Curio trigger, returning nothing to your hand from the battlefield.
5. Resolve the Deranged Hermit trigger, creating four 1/1 Squirrel creature tokens.
6. The Squirrels enter the battlefield, triggering Mana Echoes four times and Cloudstone Curio four times.
7. Resolve the first Cloudstone Curio trigger, returning Deranged Hermit from the battlefield to your hand.
8. Resolve all remaining Cloudstone Curio triggers, returning nothing to your hand from the battlefield.
9. Resolve all Mana Echoes triggers, adding 4 for each Squirrel you control, plus 1 for each Elf you control.
10. Repeat from step 2.