You can find the cards with errors but going to the app and scrolling down on certain erratad cards
They are all artifacts that have no colour requirement to cast that either bring utility, value, evasion or low casting cost, the best have several of these things
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Keep ~36 lands and balance the swarm
Take Kenessos, for example, who can put them directly into play for a reasonable mana investment
Rhystic Study Rhystic Study is a Blue Enchantment that allows its controller to draw a card whenever an opponent casts a spell at the cost of one mana of any color
