For most players, that is a feature, not a bug
Were getting a lot of cheap Flash equipment with until end of turn effects recently, so consider how cost reducers for artifacts factor into the equation, because that can turn them from meh to medium pretty quick
They also create intrigue in the way they're built - after having done some research, I think there's obvious upgrades for both that aren't too hard to find
With Firebolt if you get to that later date you will still be able to get your value and casting it early without regret is a good way of getting to later in the game
Spider-Rex, Daring Dino brings sheer stats with a 6/6 body, trample, reach, and ward, so its a resilient beater that also fits the spider theme in an offbeat way