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Malboro Kind of a funny name (I don't really know Final Fantasy at all outside of a few games), but the effect is really strong

Archmage's Charm has some versatility, but since it costs three blue mana, that pretty much limits it to mono-blue decks

Powerstones have limited use, but you can usually find a mana sink to filter the mana through, if not just use them as fodder for some artifact sacrifice engine

At first, it seemed like this card would be unbeatable

If I can get black up to having four (just about) cube worthy one mana removal spells (not including Dismember as that is any colour) I think the colour will be in a much better place