To pull off this explosive loop, you start by establishing Undermountain Adventurer to take the initiative and tap for a massive influx of green mana once your dungeon is complete. However, its own tap ability normally leaves it sidelined, which is where Ringing Strike Mastery comes in to enchant it. By using the six green mana generated by Undermountain Adventurer to pay the five-mana cost granted by Ringing Strike Mastery, you untap the adventurer and leave yourself with a net surplus of mana to repeat the process indefinitely.