Good utility cards but playing them mainly for their countering potential is unadvisable
X burn spells are excellent in Limited, they scale as the game goes on, unlike most Red removal spells meaning this can kill pretty much anything
You must follow all normal timing rules for spells cast and lands played using the middle ability and must pay all costs for spells cast this way
Indeed, even now, its because Ive been making a deck that Im writing this episode, a deck which you can find by clicking this link: Every Merfolk Looter in the Command Zone Rated: I had a friend who used to play this Jace, back when I played Kothophed as a legend of choice
But so long as youre prepared to negotiate, and you keep some amount of defenses up, you should be fairly safe in the early and mid-game
in Llanowar, one bone is broken for every twig snapped underfoot