So I wanted to find a card that had hidden greatness, and what I found was Descent into Madness. There is no doubt that this card is powerful, the only thing is can you wield this power?
The tricky part about Descent into Madness is that it effects both players. The key to controlling it is being able to outlast your opponent by being able to play cards that give you card advantage in this circumstance. For instance, cards that apply pressure to your opponent while Descent into Madness is in play, also cards that give you multiple food for Descent into Madness to gobble up.
Key Cards
Descent into Madness This forces both players to find a strategy around it. Also it can force the game into a draw if the match-up is not a good one.
Desecration Demon This is your main condition, pounding damage through early or clearing enemy creatures one at a time.
Liliana of the Veil She by herself is a Descent into Madness, Play her while it is out and ultimate her after you exile descent and you have devastated your opponent even more.
Thragtusk Will gain you life to make sure you can get Descent into Madness out or another key card. Also if needed, is a decent sacrifice to Descent, because of the 3/3 body.
Army of the Damned This is more of a card for the WTF factor, but this could also be a viable win condition while Descent into Madness is out.
Honorable Mention Cards
Arbor Elf A good 1 drop that helps build board presence early.
Avacyn's Pilgrim Another decent 1 drop that helps build board presence early, but not as good as Arbor Elf.
Borderland Ranger This guy is a decent 2/2 body that also replaces the spot in hand for a land, which helps when Descent into Madness is out.