How can you create a combo with Malcolm, Keen-Eyed Navigator, Lightning-Rig Crew, Umbral Mantle?
user
[START OF COMBO]This combo can be formed with Malcolm, Keen-Eyed Navigator, Lightning-Rig Crew, Umbral Mantle

Color identity: UR
Mana cost: 
Steps:
  1. Activate Lightning-Rig Crew by tapping it, dealing 1 damage to each opponent.
  2. Malcolm triggers, creating a Treasure artifact token for each opponent dealt damage this way.
  3. Activate three Treasures by tapping and sacrificing them, adding {3}.
  4. Activate Lightning-Rig Crew by paying {3} and untapping it, giving it +2/+2 until end of turn.
  5. Repeat until you have two or less opponents remaining.[END OF COMBO STEPS]

Result:
  - Near-infinite damage to all other opponents
  - Infinite damage to target opponent
  - Near-infinitely large Lightning-Rig Crew until end of turn[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Umbral Mantle attached to Lightning-Rig Crew.
  - Lightning-Rig Crew does not have summoning sickness.
  - You have at least three opponents.
[END OF COMBO PREREQUISITES]
assistant