Lotus Ring + Puresteel Paladin + Marneus Calgar + Hammer of Purphoros

Lotus Ring

Puresteel Paladin

Marneus Calgar

Hammer of Purphoros

How it works

1. Activate Marneus Calgar by paying 6, creating two 2/2 Astartes Warrior creature tokens.
2. When the Astartes Warriors enter the battlefield, Marneus Calgar triggers, causing you to draw a card.
3. Activate Lotus Ring's equip ability by paying 0 due to Puresteel Paladin, attaching it to an Astartes Warrior.
4. Activate the Astartes Warrior with Lotus Ring attached by tapping and sacrificing it, adding 3.
5. Repeat from step 3 for the remaining Astartes Warrior.
6. Repeat from step 1.

This clever loop is anchored by Marneus Calgar, whose Chapter Master ability acts as the mana-sink engine to repeatedly spawn two Astartes Warrior tokens while his Master Tactician ability draws cards off their entry. To make this self-sustaining, Puresteel Paladin grants a metalcraft-enabled equip cost of {0} so that Lotus Ring can be instantly attached to the fresh recruits without spending mana. Once suited up, those tokens fulfill the sacrifice requirement of Lotus Ring's activated ability to refund the mana needed to keep casting Marneus Calgar's token-making ability, all while Hammer of Purphoros stands ready to give your board haste if needed.