Lord Skitter, Sewer King + Void Attendant + Earthcraft + Maskwood Nexus

Lord Skitter, Sewer King

Void Attendant

Earthcraft

Maskwood Nexus

How it works

1. Activate a basic Forest by tapping it, adding .
2. Activate Void Attendant by paying 1 and putting a card an opponent owns from exile into their graveyard, creating a 1/1 Eldrazi Scion creature token.
3. When the Eldrazi Scion enters the battlefield as a Rat due to Maskwood Nexus, Lord Skitter's first ability triggers, exiling a card from an opponent's graveyard.
4. Activate Earthcraft by tapping the Eldrazi Scion, untapping a basic Forest you control.
5. Activate the Eldrazi Scion by sacrificing it, adding C.
6. Repeat.

This loop transforms your mana into an engine of endless generation by weaving together tribal transformation and graveyard resource recycling. Maskwood Nexus is the linchpin that turns every creature you make into a Rat, ensuring that whenever Void Attendant spits out an Eldrazi Scion, Lord Skitter, Sewer King sees it arrive and feeds on your opponent's graveyard. You can then tap that Scion to Earthcraft's enchantment ability to untap your basic land, cycling the mana to pay for Void Attendant's activation while leaving the Scion ready to sacrifice for colorless mana.