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Coldsteel Heart is efficient utility, plain and simple

All you need is a demon in play to draw cards and siphon life each turn, and you can even create one when you unlock Ritual Chamber

It belongs to the Amethyst suite of cards and, at first glance, has an interesting ability that might cause people to overlook it

Of those, 4 of the uncommons have a lurking evil version and 4 have a paranormal frame version, each showing up 1 in 4 times you see that uncommon

The end result is a deck that is low to the ground and casts lots of spells per turn, swinging in each turn to chip down life totals and then closing out the game with a combination of burn and creature combat

You can later cast the spell from exile by paying its printed mana cost