How can you create a combo with Marneus Calgar, The Watcher in the Water?
user
[START OF COMBO]This combo can be formed with Marneus Calgar, The Watcher in the Water

Color identity: WUB
Mana cost: {1}
Steps:
  1. Draw a card during an opponent's turn by triggering Marneus Calgar using his activated ability, or by any other method.
  2. The Watcher in the Water triggers, creating a 1/1 Tentacle creature token.
  3. When the Tentacle enters the battlefield, Marneus Calgar triggers, causing you to draw a card.
  4. Repeat from step 2.
  5. After drawing any number of cards, interrupt the mandatory infinite loop by winning the game or removing a combo piece in response to a trigger.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite draw triggers
  - Near-infinite creature tokens
  - Near-infinite enters the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You have a way to draw a card during an opponent's turn.
  - You have a way to interrupt the loop after drawing your library.
[END OF COMBO PREREQUISITES]
assistant