That creates a powerful way to build around him, but you are casting your foe's stuff, not yours, so it's harder to break
There are a selection of powerful items in the game to be sure
It's common for Gruul Stompy decks not to include any card with a mana value of more than four, usually Questing Beast being the highest end
Its in my Children of a Greater God deck, which I happened to play very recently
Lae'zel, Vlaakith's Champion Keeping in the theme of giving Baldur's Gate characters with generic mechanics, Lae'Zel, Vlaakith's Champion is a generic go-wide MTG Card that doesn't do much to affect the meta
Arcums Weathervane and Arcums Sleigh made use of Snow-covered Lands while Arcums Whistle allowed you to have a Norritt that destroyed the target creature at end of turn, unless the casting cost was paid