Requires

Railway Brawler must be on the battlefield. Crystalline Crawler must be in hand. Meticulous Excavation must be on the battlefield. Mana needed: available in at least three different colors

Steps

1. Cast Crystalline Crawler by paying , ensuring to spend at least three different colors of mana to cast it, causing Crystalline Crawler to enter the battlefield with at least three +1/+1 counters on it.
2. When Crystalline Crawler enters the battlefield, Railway Brawler triggers, putting four +1/+1 counters on it.
3. Activate Crystalline Crawler's first ability by removing all +1/+1 counters from it, adding and the remaining mana in any combination of color(s).
4. Activate Meticulous Excavation by paying , returning Crystalline Crawler to your hand from the battlefield.
5. Repeat.

Results