Kitsa, Otterball Elite, and Ready // Willing

Prerequisites

• Kitsa, Otterball Elite on the battlefield
• Ready // Willing in hand
• available

Steps

1. Cast Ready by paying
2. Kitsa's prowess ability triggers, giving it +1/+1 until end of turn
3. Holding priority, activate any number of creatures by tapping them, adding at least
4. Activate Kitsa's second ability by paying and tapping it, copying Ready
5. Resolve the copy of Ready, untapping all creatures you control
6. Repeat from step 3

Results

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