So, I have a creature enchanted with Grasp of the Hieromancer. I attack with it and tap a Leaf Gilder. Did I just put a green mana into my opponent's mana pool?
No.
When you attack with the creature, you targeted the Leaf Glider. The ability hasn't resolved yet.
Your opponent has the opportunity to do things. He can tap the Glider for mana if he wishes, but doesn't have to.
If he does nothing the Grasp trigger resolves and the Glider is tapped - but not to add mana.
When you attack with the creature, you targeted the Leaf Glider. The ability hasn't resolved yet.
Your opponent has the opportunity to do things. He can tap the Glider for mana if he wishes, but doesn't have to.
If he does nothing the Grasp trigger resolves and the Glider is tapped - but not to add mana.