Any troop that can’t be mana drained also can’t do anything interesting with its spell. Board transformers, spawners, or exploders should always be drainable because their spells can turn the tide of a battle single-handedly: everyone who has ever faced Valkyrie/Justice/Mab can attest to this. The only troop I would want to see with immunity to mana draining would have a simple damage spell, possibly boosted by something that doesn’t change the board during the spell’s resolution (number of goblins, number of reds, etc.).
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