mtg draw a card for each attacking creature Magic The Gathering - Foundations - Inspiring Call Rules Text: draw a card

Find what you need, pay two life

Planechase isn't its own format, instead being additional rules that players add to their game

Holding up just two mana on turn two or three allows you to leave up Counterspell and still make plays on your own turn

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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Pair The Master of Keys with cards like Skybind, Blightcaster, or Archon of Sun's Grace, which all shine with enter-the-battlefield effects