Some time ago people used to run pyrokinesis main, I believe, in aggro infested metas. If that's your case, go for it. Just remember: against almost everything that isn't Tribal or Zoo it's pure card disadvantage: Can't kill a stalker, a 'nought, a goose with it. It can kill goyfs, but that's a 2:1. About Caller of the Claw: seems interesting, although Boartusk Lieges can handle the most used board sweepers (Pyroclasm, Volcanic Fallout, Firespout) without the need of leaving mana open on their turn and it also happens to solve Engineered Plague, something that Caller of the Claw doesn't help in any way. Caller of the Claw is clearly superior against Wrath of God, so if you expect to face some Landstill decks it's a nice option.