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While Mystic may be more powerful than some of the others it is somewhat less unique in blue

This could hypothetically push the deck towards a bigger diversity of deck types, especially as Disney Lorcana has largely been dominated by a few specific kinds of decks

Stoneforge Mystic does that with equipment, preferably those that have mechanics like living weapon or for Mirrodin!, which are put into your hand and later onto the battlefield

MTG creature cards are color-coded according to the type of mana needed to play them, such as a green/red creature or even a colorless Eldrazi creature

Even though on average you will see two targets when you Impulse with a deck of 2/3rds targets and thus have the same selection potential as Sleight there are several reasons why that is worse