Scuttling Sliver + Trazyn the Infinite + Empowered Autogenerator + Unnatural Selection

Scuttling Sliver

Trazyn the Infinite

Empowered Autogenerator

Unnatural Selection

How it works

1. Activate Unnatural Selection by paying 1, causing Trazyn to become a Sliver until end of turn.
2. Activate Trazyn using Empowered Autogenerator's ability by tapping it, putting a charge counter on it and adding one mana of any color for each charge counter on it.
3. Activate Trazyn by paying 2, untapping it.
4. Repeat from step 2.

This cunning loop turns the graveyard into a powerhouse by letting Trazyn the Infinite inherit the activated abilities of Empowered Autogenerator while it rests in the bin. By using Unnatural Selection to temporarily give Trazyn the Sliver creature type, Scuttling Sliver grants him the ability to untap himself for two mana. Since the mana generated by Empowered Autogenerator scales up with every iteration of tapping and untapping, this sequence quickly yields infinite colored mana.