Miscost Ghalta

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I've got a Ghalta in my hand right now which appears to cost 2 mana (It's half full of mana, and the remaining mana cost, shown in green, is 1)

The thing is tho that I have 12 Thopter tokens in play (12/12), and 2 Ghaltas (28/28, because I'm playing the Golgari Swarm RT, and I played one Gather the Pack between casting them)

So my Ghalta in hand should cost 0?