How can you create a combo with Sandsteppe Mastodon, Roaring Primadox, Sage of Hours?
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[START OF COMBO]This combo can be formed with Sandsteppe Mastodon, Roaring Primadox, Sage of Hours

Color identity: GU
Mana cost: {5}{G}{G} each turn
Steps:
  1. Cast Sandsteppe Mastodon by paying {5}{G}{G}.
  2. Sandsteppe Mastodon enters the battlefield, putting five +1/+1 counters on Sage of Hours.
  3. Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one.
  4. Move to your next turn.
  5. At the begging of your upkeep, Roaring Primadox triggers, causing you to return Sandsteppe Mastodon from the battlefield to your hand.
  6. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - Sandsteppe Mastodon must be in your hand
  - Roaring Primadox must be on the battlefield
  - Sage of Hours must be on the battlefield
  - Sage of Hours has the lowest toughness or is tied for the lowest toughness among creatures you control.
[END OF COMBO PREREQUISITES]
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