Stella Lee, Wild Card, and Intruder Alarm

Prerequisites

• Stella Lee, Wild Card on the battlefield
• Intruder Alarm on the battlefield
• You have cast at least two spells this turn
• You have enough mana to cast the instant or sorcery
• Stella Lee does not have summoning sickness

Steps

1. Cast the instant or sorcery by paying its mana cost
2. Holding priority, activate Stella Lee by tapping it, copying the instant or sorcery
3. Resolve the copy of the instant or sorcery, creating at least one creature token
4. When the creature token(s) enter the battlefield, Intruder Alarm triggers that many times, untapping all creatures
5. Repeat from step 2

Results

• Infinite copies of the casted instant or sorcery
• Infinite creature tokens
• Infinite magecraft triggers
• Infinite mana creatures you control can produce
• Infinite untap of all creatures