MTG >Combos >Thornbite Staff +Cathodion +Phyrexian Altar +Feldon of the Third Path +

Equip Feldon with Thornbite Staff and activate their ability to create a token that is a copy of Cathodion Sacrifice the token with Phyrexian Altar to add one red mana Thornbite Staff ability will trigger, untap Feldon Cathodion's ability will trigger, add three mana Repeat the process for infinite mana.