Ooh spicy. Might be a really good fit for my Estrid deck as I'm lacking a good win con there.
Meeting the ability's requirements shouldn't be that hard for that point of the game you play this thing in. Repeated End-Raze Forerunner effect for attacks seems really good.
It'd eat removal quickly, but, since it's an enchantment, cards like Sterling Grove make it a little more resilient. Awesome card!
If it gave trample, it'd probably be too strong