Intruder Alarm + Invasion of Segovia // Caetus, Sea Tyrant of Segovia + Lab Rats

UB identity

Commander legal

The 3 combo pieces

What must be in place

Sea Tyrant of Segovia.
You control at least five untapped creatures, one of which must be black.

How to execute it

  1. Cast Lab Rats with buyback by tapping five creatures you control, one of which must be black.
  2. Resolve Lab Rats, creating a 1/1 Rat creature token and returning Lab Rats to your hand.
  3. When the Rat enters the battlefield, Intruder Alarm triggers, untapping all creatures.
  4. Repeat.

What the combo produces