An easy enough question, and I'll start. Favourite: Doomguard; least favourite: Polymorph, so powerful for so cheap. Yeah, I play a Warlock, so what?

It really depends on the class I'm playing, but I'll bite.

Favorite: Faceless Manipulator. It's so versatile. Can be used to mask your decks deficiencies or snowball momentum.

Least: Shadowstep. I originally put Leeroy as my favorite, but Leeroy in combination with Shadowstep is the literal worst thing in the game right now. Leeroy either needs to get the faerie dragon nerf (cannot be targeted by spell powers), or preferably Shadowstep gets the nerf.

Bonus - Favorite Looking: Golden Abomination.

Ysera is the coolest card in the game, Velen is probably my favorite though. Quite a few cards are bad but flamestrike and fireball are probably the worst (I do extremely well against mages but those cards are still lame regardless). I guess Argent Commander is my least favorite; such a boring, boring card.

My least favourite are all the cards that are basically neutral Fireballs. Argent Commander, Leeroy Jenkins, Ragnaros, all stupid.

I really like Frothing Berserker.

Leeroy is a good answer for both.

Favorite card Chillwood Yeti 4/5 stats make it normally last a turn and trade if there isn't removal like Frostbolt involved.

Leastfavorite probably either Sacrifical Pact or Ice Lance, the latter is useful in freeze mage but both cards are very circumstantial.

Least favorite, the cards I don't have, which is almost all of them?

I did just get Jaraxxus, or whatever his name is. Fun card to use, even if it's a bit awkward. Very rare he actually makes a difference. But dude yells stuff in all caps, he's the Zodiac Motherfucker of Hearthstone.

On a side note, it's really amazing how annoyed I can get at people getting cocky when all people can say are 6 things.

Favourite: Knife Juggler, Any time you play a dude he bolts the opponent.

Least Favourite: Every Legendary

Just use squash on them.