How can you create a combo with Tetravus, Sage of Hours, Cathars' Crusade?
user
[START OF COMBO]This combo can be formed with Tetravus, Sage of Hours, Cathars' Crusade

Color identity: WU
Mana cost: 
Steps:
  1. At the beginning of your upkeep, Tetravus' first and second abilities trigger.
  2. Resolve Tetravus' second ability, choosing not to exile any tokens.
  3. Resolve Tetravus' first ability, causing you to remove five +1/+1 counters from Tetravus to create five 1/1 Tetravite creature tokens.
  4. The Tetravites enter the battlefield, triggering Cathars' Crusade five times, putting five +1/+1 counters on each creature you control.
  5. Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one.
  6. Repeat each turn.[END OF COMBO STEPS]

Result:
  - Infinite turns[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Tetravus has at least five +1/+1 counters on it.
[END OF COMBO PREREQUISITES]
assistant