Mondrak, Glory Dominus + Eldrazi Displacer + Blessed Sanctuary + Ashnod's Altar

Mondrak, Glory Dominus

Eldrazi Displacer

Blessed Sanctuary

Ashnod's Altar

How it works

1. Activate Eldrazi Displacer by paying 2C, blinking any other nontoken creature you control.
2. When the creature enters the battlefield, Blessed Sanctuary triggers, creating two 2/2 Unicorn creature tokens.
3. Activate Ashnod's Altar twice by sacrificing the Unicorns, adding CCCC.
4. Repeat.

This elegant loop harnesses Eldrazi Displacer to repeatedly exile and return a creature, using the colorless mana generated from Ashnod's Altar to fund the ability entirely. Every time your blinked creature returns, Blessed Sanctuary spots the entry and spawns a Unicorn token—an output that is immediately doubled thanks to Mondrak, Glory Dominus sitting passively on your board. Sacrificing those duplicated Unicorns back to Ashnod's Altar yields more than enough colorless mana to pay for Eldrazi Displacer's activation while leaving a surplus of mana and an endlessly growing army behind.