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On play, all your DON

But theres also a type of spell that doesnt care whats on the other side of the battlefield, or even whats on yours

Sephiroth, One-Winged Angel: Legendary Creature - Angel Nightmare Avatar Flying Super Nova - As this creature transforms into Sephiroth, One-Winged Angel, you get an emblem with "Whenever a creature dies, target opponent loses 1 life and you gain 1

Once you have three or four mana sources all further ones are your weakest draws and so losing them is far less severe than losing a coloured card

Baby Jace is very reliable in this deck, and it ended up that tutoring for 2-drops and 3-drops worked best since the Transmute cost is usually 3 mana