Livaan, Cultist of Tiamat is a uncommon Legendary Creature — Dragon Shaman card from Commander Legends: Battle for Baldur's Gate (CLB), collector number 508.
Whenever you cast a noncreature spell, target creature gets +X/+0 until end of turn, where X is that spell's mana value. Choose a Background (You can have a Background as a second commander.)
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