Sliver Queen + Agatha of the Vile Cauldron + Manaweft Sliver + Cloudshredder Sliver

Sliver Queen

Agatha of the Vile Cauldron

Manaweft Sliver

Cloudshredder Sliver

How it works

1. Activate Silver Queen by paying 1, creating a 1/1 Sliver creature token.
2. Activate the Sliver token by tapping it, adding 1.
3. Repeat.

This elegant swarm uses Agatha of the Vile Cauldron's cost-reduction ability to discount Sliver Queen's token-creation ability down to just a single mana. Manaweft Sliver and Cloudshredder Sliver then step in as the engine's enablers: Cloudshredder Sliver grants haste so the new tokens don't have to suffer summoning sickness, allowing them to immediately tap for mana thanks to Manaweft Sliver's ability. By cycling that generated mana right back into the discounted Queen, you churn out an endless tide of creatures and enters-the-battlefield triggers.