Lotus Ring + Puresteel Paladin + Nemata, Grove Guardian + Jinnie Fay, Jetmir's Second

Lotus Ring

Puresteel Paladin

Nemata, Grove Guardian

Jinnie Fay, Jetmir's Second

How it works

1. Activate Nemata's first ability by paying 2, creating a 2/2 Cat creature token with haste.
2. Activate Lotus Ring's equip ability by paying 0 due to Puresteel Paladin, attaching it to the Cat.
3. Activate the Cat by tapping and sacrificing it, adding .
4. Repeat.

This loop spins up into infinity by transforming mana into an escalating army through Jinnie Fay, Jetmir's Second, who steps in to replace your token creation by turning Nemata, Grove Guardian's Saproling-making ability into a stream of hasty 2/2 Cats. Once a Cat hits the battlefield, Puresteel Paladin's metalcraft ability kicks in to let you strap on Lotus Ring for free, converting the equipment's heavy equip cost into a zero-mana maneuver. Finally, you tap and sacrifice that very same Cat using Lotus Ring's own sacrifice ability to net three mana, more than funding the next generation of token creation and keeping the cycle running forever.