Pair The Master of Keys with cards like Skybind, Blightcaster, or Archon of Sun's Grace, which all shine with enter-the-battlefield effects
Before starting sketches, every concept artist should prepare a thorough moodboard
(If this creature has no +1/+1 counters on it, put a +1/+1 counter on it.) Whenever one or more +1/+1 counters are put on this creature, you may create a 0/1 colorless Eldrazi Spawn creature token with "Sacrifice this token: Add ." : Adapt 1
His second ability is very niche and won't really ever be relevant, but in the pirate deck, as a 5/4 for 5 with Rush and the ability to ready himself, he'll be solid
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Holding up just two mana on turn two or three allows you to leave up Counterspell and still make plays on your own turn