Holding priority, activate Myojin of Cryptic Dreams by removing an indestructible counter from it, copying the Cultivator Colossus spell three times.
Resolve the first Cultivator Colossus copy.
The Cultivator Colossus token enters the battlefield, putting Boros Garrison from your hand onto the battlefield, drawing a card, and choosing not to repeat the process.
Boros Garrison enters the battlefield, triggering itself and Evolution Sage.
Resolve the Boros Garrison trigger, returning it from the battlefield to your hand.
Resolve the Evolution Sage trigger, putting an indestructible counter on Myojin of Cryptic Dreams.