This makes Runaway Steam-Kin good for any mono-red Commander deck
I activate Griselbrand once, drawing Lotus Petal and Emrakul, the Aeons Torn to end the game and match on the spot
When it enters the battlefield, if the player discards a card with one of many forms of counters on it, including flying, then the Indominous Rex enters with that type of counter on it
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Finally, Dredge might also side in Abrupt Decay or Leyline of Sanctity for protection from dedicated Burn decks, though getting it in the opening hand is essential.
Second, blues affinity for instants, sorceries, and artifacts gives you a lot of possibilities when focusing on which creatures your deck wants to be blinking