This is good because of the Twinspell, otherwise, this would not be worth putting into your deck. Also in pure Paladin decks, you can get this randomly generated which means flooding the board with no deck slots wasted.
If you think this is bad, then what about this....
Turn 1, Brazen Zealot. Turn 2, Air Raid. Brazen attacks for 4 damage. If they cannot kill the Brazen the opponent is in deep trouble. Ping classes can go ahead and kill it, but other than Mage, will be tanking another 4 damage.
Then you have Sky Claw OR Air Raid again on turn 3. If that is your curve, your opponent will not have a chance.
This also can work in a Highlander style deck, giving you 2 spells for 1 card slot AND board presence.
How is this bad exactly?
Warrior has the invoke card that does 1 damage to all minions, and warpath. Goodbye to your big opening.
Rogue has fan of knives.
Hunter has the dogs.
Yeah but you're usually doing alright if you're forcing your opponent to react to your moves and use up their resources. If they're using those cards on turn 2-4 and my deck is built right I see that as a positive
Ya'll are silly if you think this isn't great. It's good by itself without mentioning synergy with Call to Adventure decks or Duel! decks. Plus all the silver hand synergy, and the value in general. Very good in short and long term. Played in Wild day 1.