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

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

Here's how the cards Kenrith, the Returned King, Phyrexian Altar, Biomancer's Familiar, and Zirda, the Dawnwaker results in Infinite death triggers, Infinite ETB, Infinite LTB, and Infinite sacrifice triggers

Kenrith, the Returned King

Phyrexian Altar

Biomancer's Familiar

Zirda, the Dawnwaker

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Prerequisites

Kenrith, the Returned King on the battlefield
Phyrexian Altar on the battlefield
Biomancer's Familiar on the battlefield
Zirda, the Dawnwaker on the battlefield
You control at least one additional nontoken creature

Steps

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