MTG >Combos >Scarecrone +Dross Scorpion +Cathodion +Ashnod's Altar +

Sacrifice Cathodion with Krark-Clan Ironworks to add two mana. Cathodion's ability will add three more mana Pay four mana to activate Scarecrone's ability, return Cathodion from your graveyard to play Dross Scorpion's ability will trigger, untap Scarecrone Repeat process for infinite mana