Kenrith, the Returned King + Phyrexian Altar + Biomancer's Familiar + Zirda, the Dawnwaker

Kenrith, the Returned King

Phyrexian Altar

Biomancer's Familiar

Zirda, the Dawnwaker

How it works

1. Activate Phyrexian Altar by sacrificing another nontoken creature, adding .
2. Activate Kenrith's fifth ability by paying due to Zirda and Biomancer's Familiar, putting the creature card onto the battlefield from your graveyard.
3. Repeat.

This clever resurrection loop turns Kenrith, the Returned King into an infinite recycling engine by leaning heavily on cost-reduction mechanics. Normally, reanimating a creature from your graveyard with Kenrith's final ability would be prohibitively expensive, but the combined static cost-reducers Biomancer's Familiar and Zirda, the Dawnwaker slice that activation cost down to just a single black mana. Once that cost is minimized, you can sacrifice the reanimated creature to Phyrexian Altar to generate the exact mana needed to bring it right back, creating a self-sustaining loop that nets you infinite death, entry, and sacrifice triggers.