I have found problems with two cards.
1)
Mana ReflectionI tested this in developer mode after there were problems with it in one of my games. Permanents that were on the battlefield:
- 6
Forest and 1
Mana Reflection on my side
- only basic lands on AI's side
When I tap a
Forest for mana, it adds GG to my mana pool. So far, so good. But then I chose to cast a
Primeval Titan from my hand. When asked to pay 4GG, I tapped one of my forests. Then I only needed to pay 2 more for the spell, meaning the forest procuded GGGG when I tapped it.
2)
Wild GrowthWhen you tap a land enchanted with
Wild Growth, you can click on the
Undo button, but nothing happens. The "
Undo" turns into "End Turn", but the land doesn't untap and you still have the mana in your mana pool.