Spawnsire of Ulamog + Adrix and Nev, Twincasters

Spawnsire of Ulamog

Adrix and Nev, Twincasters

How it works

1. Activate Spawnsire of Ulamog by paying 4, creating four 0/1 Eldrazi Spawn creature tokens.
2. Activate the Eldrazi Spawns by sacrificing them, adding CCCC.
3. Repeat.

This elegant loop relies on the geometric scaling provided by Adrix and Nev, Twincasters to turn Spawnsire of Ulamog's token-making ability into a self-sustaining mana engine. While Spawnsire of Ulamog normally pays four mana to generate two Eldrazi Spawn, the replacement effect from Adrix and Nev, Twincasters doubles that yield into four tokens. Since sacrificing all four generated tokens nets you exactly four colorless mana, you can continuously repeat the process to feed your death and sacrifice triggers infinitely.