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

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Missy

Phyrexian Altar

Voidmage Prodigy

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

Infinite green mana

Infinite landfall triggers

Yedora, Grave Gardener

Combos with "Voidmage Prodigy"