MTG >Combos >Boonweaver Giant +Phyrexian Altar +Kaya's Ghostform +

Enchant

Kaya's Ghostform

onto

Boomweaver Giant

and then sacrifice it with

Phyrexian Altar

. Kaya's Ghostform will return the Boomweaver to the battlefield. Its effect will trigger and return Kayas Ghostform from the graveyard attached to it. Repeat for infinite mana.