add unfinished potions set

Potions are designed as a different on field resource to diversify
game play.
Potions may be used offensively or defensively.
They are a on field equivalent to spells with harder timing restrictions,
public information but artifact synergies and thus should be cheaper
than their spell equivalent.
In particular because unused spells can be used to generate resource
by discarding two cards. Played potions are "dead" until they are used.

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