Spells: Succor's mana cost and additional mana drain is egregiously broken

[Bummey]

EDIT: Bonus Egress test

500 mana cost, no mana drain component.

Before cast, full mana:
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After cast, while loading:
No change
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Loaded in at safe spot: 450 fewer mana than before cast
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Total cost of 450 mana? There must have been a server tick or three hidden in the loading that caused some standing mana regen.