This fight is super easy provided your mulligan contains the Rare Spear. If it does, it's very hard to lose. If it doesn't, it's probably faster to concede and try again until you draw it.
Removed both Revenge as well as Sir Finley. Thanks to you guys as well as another voice on a different forum, Coliseum Manager was brought to my attention as a good card for this deck. This is very true. He won't gain any value from the attack as the hero power triggers immediately. Very smart, guys.
I dropped Sir Finley for another Mana Addict. The reason for this is simple: Sir Finley isn't Rare and he has a low chance of drawing him, and even if he does I'm not certain his hero power can be overwritten. There are only two spells in the deck, and if he gets *any* value from that with Mana Addict, it'll be a paltry +2 damage. No big deal. She's another 1-drop that will buff your win condition so it's a reasonable trade-off.