Prerequisites
- Myr Propagator on the battlefield
- Mana Echoes on the battlefield
- Concordant Crossroads on the battlefield
- at most available
Steps
- Activate Myr Propagator by paying and tapping it, creating a token copy of it
- When the Myr Propagator token enters the battlefield, Mana Echoes triggers, adding for each Myr you control
- Repeat using the Myr Propagator token instead
Results
Required Cards 3
Myr Propagator
Artifact Creature — Myr
Concordant Crossroads
World Enchantment