So I was playing EDH in a side event at the Nat's Qualifier this past weekend, and the dude across from me set up an infinite mana Fireball. It got countered by another guys Glen Elendra, but I never stopped to see how he got the combo.
My question is, how did he do this?! I know he had a Grim Monolith, enchanted with Power Artifact, but that's all I know. Can anyone figure out the piece that I'm missing? Thanks