Tyvar's Stand For X=0
While playing a traditional draft match, I used all my mana save for a single forest, for the card Tyvar's Stand, which has a scalable mana cost of Xg.
When my opponent targeted one of my creatures with a spell, I went to cast Tyvar's Stand with X=0, clicking the confirmation button immediately when prompted.
I was prompted to pay 1g to cast the spell, which is the cost for X=1. I looked around the interface, but it didn't let me cast the spell otherwise, it always asked as if X=1.
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