The interesting design challenge of charms comes on two-color versions
In reality, a second- or third-turn Mana Drain often fuelled Mahamoti Djinn, a huge Braingeyser, a game-ending Mind Twist, or any other number of ridiculously accelerated plays
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And you can get it foil for under 1
Phyrexian Altar turns a creature into a mana, which sounds tame
