I once used it on a single player's Academy Ruins, Mind's Eye, Akroma, Angel of Wrath, and Sylvan Library
The only really viable deck for the Treasure Mage is a big mana artifact deck for which there are so many options on very powerful cards the Mage is frequently sidelined
Where it does shine is how it buffs all your guys elves, take note by giving them not only trample, but also +X/+X, where X is the number of creatures you control
Two, this helps current discard decks control what your opponent is or isn't going to dop deck
In FF7, this creates an epic boss battle that can be somewhat difficult depending on how early on you take the fight in the original game, and how prepared you are in Rebirth
6 Rooftop Storm It's alive