Activate Soul of Zendikar's first ability by paying {5}, creating a 3/3 Beast creature token.
The Beast enters the battlefield, triggering Mana Echoes, adding at least {C}{C}{C}{C}{C}.
Repeat.

Infinite colored mana

Infinite colorless mana

Infinite creature tokens

Infinite ETB

Soul of Zendikar

Mana Echoes

Mycosynth Lattice

Activate Chromatic Orrery's first ability by tapping it, adding {5}.
Activate Soul of Zendikar's first ability by paying {5}, creating a 3/3 Beast creature token.
The Beast enters the battlefield, triggering Mana Echoes, adding at least {C}{C}{C}{C}{C}.
Repeat from step 2.

Combos with "Soul of Zendikar"