Mana produced with Gwenna, Eyes of Gaea cannot be spent on vehicle ability
I tapped Gwenna, Eyes of Gaea for 2 mana and could not spend it on 2 mana ability of Reckoner Bankbuster, which was a creature at the moment
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Canabalt#35857
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Rezzahan#77802 commented
Your Bankbuster may have been a creature at that time, but it was also affected by summoning sickness because of it (not becasue it turned into a creature, mind you, but because it came under your control after your most recent turn began presumably).