Activate Phyrexian Altar by sacrificing Foothill Guide, adding {W}.
When Foothill Guide dies, Yedora triggers, returning Foothill Guide from your graveyard to the battlefield face down as a Forest land.
Activate Foothill Guide by tapping it, adding {G}.
Activate Foothill Guide's morph ability by paying {W}, turning it face up.
Repeat.

Infinite death triggers

Infinite green mana

Infinite landfall triggers

Infinite LTB

Infinite sacrifice triggers

Yedora, Grave Gardener

Phyrexian Altar

Foothill Guide

Activate Phyrexian Altar by sacrificing Foothill Guide, adding {W}.
When Foothill Guide dies, Missy's first ability triggers, returning Foothill Guide from your graveyard to the battlefield face down as a 2/2 Cyberman artifact creature.
Activate Foothill Guide's morph ability by paying {W}, turning it face up.
Repeat.

Infinite ETB

Missy

Combos with "Foothill Guide"