Cloudstone Curio + Deep Forest Hermit + Mana Echoes + Chromatic Orrery

Cloudstone Curio

Deep Forest Hermit

Mana Echoes

Chromatic Orrery

How it works

1. Activate Chromatic Orrery's first ability by tapping it, adding 5.
2. Cast Deep Forest Hermit by paying 5.
3. Deep Forest 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 Deep Forest 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 Deep Forest 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 and/or Druid you control.
10. Repeat from step 2.