Scuttling Sliver + Trazyn the Infinite + Unnatural Selection + Nyx Lotus

Scuttling Sliver

Trazyn the Infinite

Unnatural Selection

Nyx Lotus

How it works

1. Activate Unnatural Selection by paying 1, causing Trazyn to become a Sliver until end of turn.
2. Activate Trazyn using Nyx Lotus's ability by tapping it, adding at least three mana of any color.
3. Activate Trazyn by paying 2, untapping it.
4. Repeat from step 2.

This loop turns your graveyard into an engine by letting Trazyn the Infinite borrow the activated abilities of any artifact cards resting there. By using Unnatural Selection to temporarily turn Trazyn into a Sliver, you grant it Scuttling Sliver's untap ability, which is normally locked away on the battlefield. With those pieces in place, Trazyn can tap to use Nyx Lotus's mana-generating ability, then use the generated mana to pay the {2} untap cost from Scuttling Sliver and repeat the process for infinite colored mana.