Railway Brawler + Crystalline Crawler + Temur Sabertooth

Railway Brawler

Crystalline Crawler

Temur Sabertooth

How it works

1. Cast Crystalline Crawler by paying 4, 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 Temur Sabertooth by paying 1, returning Crystalline Crawler to your hand from the battlefield.
5. Repeat.

This clever loop revolves around turning Crystalline Crawler's capacity to convert counters into mana into a self-sustaining engine. Because Railway Brawler doubles down on that investment by showering entering creatures with +1/+1 counters equal to their power, every time Crystalline Crawler re-enters, it arrives with a massive surplus of counters. You then strip those counters for a windfall of colored mana, using just a fraction of it to fund Temur Sabertooth's ability to bounce the Crawler safely back to your hand. Replaying the creature resets the cycle, letting you farm infinite mana, enter-the-battlefield triggers, and storm count with absolute ease.