How can you create a combo with Lullmage Mentor, Intruder Alarm?
user
[START OF COMBO]This combo can be formed with Lullmage Mentor, Intruder Alarm

Color identity: U
Mana cost: 
Steps:
  1. Whenever an opponent casts a spell, activate Lullmage Mentor by tapping seven Merfolk you control, countering that spell.
  2. Lullmage Mentor triggers, creating a 1/1 Merfolk creature token.
  3. The Merfolk token enters the battlefield, triggering Intruder Alarm, untapping all creatures.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Counter all spells your opponents cast[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You control at least seven Merfolk.
[END OF COMBO PREREQUISITES]
assistant