Intruder Alarm, and Lilysplash Mentor

Prerequisites

• Intruder Alarm on the battlefield
• Lilysplash Mentor on the battlefield
• available

Steps

1. Activate all mana-producing creatures you control by tapping them, adding at least enough mana to activate Lilysplash Mentor
2. Pay the mana cost to activate Lilysplash Mentor's ability, exiling another creature you control and returning it to the battlefield with a +1/+1 counter
3. Intruder Alarm triggers, untapping all creatures
4. Repeat

Results

• Infinite blinking
• Infinite creature ETB
• Infinite creature LTB
• Infinite mana creatures you control can produce
• Infinite untap of most creatures you control