Deadeye Navigator + Blessed Sanctuary + Ashnod's Altar + Chromatic Orrery

Deadeye Navigator

Blessed Sanctuary

Ashnod's Altar

Chromatic Orrery

How it works

1. Activate Deadeye Navigator by paying 2, blinking it.
2. When Deadeye Navigator enters the battlefield, its soulbond ability and Blessed Sanctuary triggers.
3. Resolve the Deadeye Navigator trigger, pairing it and another creature you control.
4. Resolve the Blessed Sanctuary trigger, creating a 2/2 Unicorn creature token.
5. Activate Ashnod's Altar by sacrificing the Unicorn, adding 2.
6. Repeat.

This loop is fueled by Ashnod's Altar, which provides the exact amount of mana required to activate Deadeye Navigator's self-blink ability over and over. As Deadeye Navigator repeatedly enters and leaves the battlefield, Blessed Sanctuary triggers off each blink to continuously churn out fresh Unicorn tokens. Meanwhile, Chromatic Orrery sits in play ensuring that the colorless mana produced by the Altar can be filtered to pay for the blue mana requirement in Deadeye Navigator's activation cost.