Sliver Gravemother + Eternal Scourge + Ashnod's Altar + Maskwood Nexus

Sliver Gravemother

Eternal Scourge

Ashnod's Altar

Maskwood Nexus

How it works

1. Activate Ashnod's Altar by sacrificing Eternal Scourge, adding CC.
2. Activate Eternal Scourge's encore ability by paying 3 and exiling it from your graveyard, creating a token copy of it with haste for each opponent you have.
3. Activate Ashnod's Altar twice by sacrificing two Eternal Scourge tokens, adding CCCC.
4. Cast Eternal Scourge from exile by paying 3.
5. Repeat.
6. If you have three or more opponents, this combo nets infinite Eternal Scourge tokens with haste and colorless mana.

Maskwood Nexus is the crucial structural piece here, granting every creature spell, card in your graveyard, and creature you control all creature types—transforming Eternal Scourge and its tokens into honorary Slivers. This opens the door for Sliver Gravemother to grant its graveyard encore ability to Eternal Scourge, allowing it to repeatedly burst forth from the graveyard into exile. Once those token copies hit the battlefield, you can sacrifice them to Ashnod's Altar for a surge of colorless mana that more than pays to cast Eternal Scourge right back out of exile to start the loop anew.