The places I would point you to in order to sell your Magic cards online and offline are eBay, TCGPlayer, Card Kingdom, Channel Fireball, Facebook, Craigslist, Local Game Stores, Card Shows/Conventions and finally Auction Houses
Ravenous Slime cant be chump blocked and it permanently gets rid of your opponents creatures when they die
Opening Hand 5 Ancestral, Bazaar, Chaos Orb, and Mind Twist, along with the mana to cast them, make this a pretty easy keep
Slime Against Humanity creates a 0/0 Ooze creature token with trample when you cast it, putting 2+X +1/+1 counters on it, with X being the number of cards in your graveyard or exile with the Ooze creature type or with the same name as Slime Against Humanity
3 - Anna - Soothing Sister (Enchanted) Another Frozen-themed card from Winterspell, this time focusing on Anna
Festival in a Box contains all the fun of a Magic event in one neat package