This is all part of a bigger problem relating to too much Magic product being released
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Once traded, unspecified items will be consumed. What we dont know about trades so far Whether it is restricted to friends only
Cheren's Care can be essential for pivoting quickly between a damaged Blissey ex and one with no damage
It also allows you to then cast a card from your hand with a mana value of X or less for free, which means you get even more value
As an aside, when one is speaking about flipping for a creature off the top of the library, that's specifically a "Polymorph" effect, and for a non-creature, it's a "Scramble." Creature The classic enablers for Polymorph strategies are unique in that they contain an artifact, meaning Blue as a color can tap into their tutor-ability both as Sorceries, and artifacts