Reins of Power, Mindslaver, and Dual Casting

Prerequisites

• Reins of Power in hand
• Mindslaver on the battlefield
• Dual Casting on the battlefield
• Dual Casting attached to a creature that does not have summoning sickness
• Creatures you control can tap to produce at least
• available

Steps

1. Activate Mindslaver by paying and tapping it, causing you to gain control of an opponent during their next turn
2. During the opponent's turn, cast Reins of Power by paying , targeting the opponent you have control of
3. Holding priority, activate all mana-producing creatures you control by tapping them, adding at least
4. Activate the creature with Dual Casting attached by paying and tapping it, copying Reins of Power
5. Resolve the copy of Reins of Power, untapping all creatures you and the opponent control, and exchanging control of those creatures
6. As the opponent, activate all mana-producing creatures you control by tapping them, adding at least
7. Activate the creature with Dual Casting attached by paying and tapping it, copying Reins of Power
8. Resolve the copy of Reins of Power, untapping all creatures you and the opponent control, and exchanging control of those creatures
9. Repeat from step 3
10. If creatures you control can tap to produce at least , you may choose to have yourself and/or the opponent you have control of to gain infinite mana

Results

• Infinite magecraft triggers
• Infinite mana creatures you control can produce
• Infinite mana creatures you control can produce for target opponent
• Infinite untap of creatures you control