Szadek, Lord of Secrets is a seven mana Blue and Black 5/5 with flying that really wants to hit your opponents in the face
Not only will it keep all of your creatures in play, it's going to allow you to draw a card for each creature a target opponent controls that is destroyed as a result of this spell
I think some of the cards in that deck can rebound given cards like Leechridden Swamp, Smallpox, Cloudthresher and Abudance being basically free right now
When you take out a five mana artifact like a Gearhulk or Gilded Lotus you are wildly ahead
There are several websites with trading card databases you can check, such as Pokemon.com, Serebii.net, Bulbapedia, and Pkmncards.com
GameStops attempt to behave like your local TCG store could only ever have been a bizarre corporate pastiche of the concept