Missy + Phyrexian Altar + Horde Ambusher

Missy

Phyrexian Altar

Horde Ambusher

How it works

1. Activate Phyrexian Altar by sacrificing Horde Ambusher, adding one mana of any color.
2. When Horde Ambusher dies, Missy's first ability triggers, returning Horde Ambusher from your graveyard to the battlefield face down as a 2/2 Cyberman artifact creature.
3. Activate Horde Ambusher's morph ability by revealing a red card from your hand, turning it face up.
4. Repeat.

This ingenious loop turns Missy's penchant for cybernetic resurrection into a self-sustaining mana engine. By sacrificing Horde Ambusher to Phyrexian Altar, you generate the exact mana needed to pay for Horde Ambusher's morph cost; as it dies, Missy steps in to salvage it, slipping it right back onto the battlefield face down as a 2/2 Cyberman artifact creature ready to be morphed up and sacrificed all over again.