I don't think I like it. A mythic legend with defender is bad enough, but one with basically the stats of Arachnoid? With an extremely restrictive reanimation ability that's only any good if you're milling yourself or it's very late game?

If you really wanted to keep this size and textbox, I reckon you could shave 2 mana off the cost. But I'd recommend losing defender, and also losing one of the restrictions on the reanimation ability, either "non-token" or "exile it and". (Okay, that latter might need a tweak to avoid some easy infinite combos... or maybe not; it's a 6-mana mythic, after all!)