Making spells cost more to cast is a powerful and disruptive ability, but at six mana it's just not going to work the way it needs to
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In the latter case, since the door becoming unlocked is what causes the ability to trigger, effects that cause abilities that trigger when a permanent enters to trigger an additional time (such as that of Panharmonicon) won't apply
Nadaar, Selfless Paladin Bold and confident, the bronze-scaled dragonborn paladin Nadaar leads the adventuring party as they explore ruins across the Forgotten Realms
