Or let it cast multiple times without recharging and have it keep to the rear (so in long battles it pays off), or let it cast spells at higher INT than the creator, or just up it's hp and def to make it into a decent "tank" unit to sit on the battlefield which incidentally casts spells, or give it its own set of unusual unique spells to cast which the player simply can't...
As it is, you get less control over what spells are cast and who they target, the spells are weaker, the spells happen later in the round, and it usually costs more mana. Pretty much the definition of useless.
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