MTG >Combos >Training Grounds +Basalt Monolith +The Blackstaff of Waterdeep +

Training Grounds reduces the cost of your creatures' abilities by two mana Transform Basalt Monolith into a creature with Blackstaff of Waterdeep Tap Basalt Monolith to add three mana, and pay one mana to untap it Repeat the process for infinite mana.