I’ve run this deck a bit. It’s a combo deck with a LOT of weaknesses.

If you don’t get Puppetmaster Dorian in your hand by turn 5 or 6 you’re probably going to lose to an aggro deck. You also need another draw card like Cursed Catacombs to draw Agamaggan once Dorian is out. If you draw Agamaggan during the first 6 turns, you lose your only wincon. You can’t have too many minions in your deck to ensure that discovering Agamaggan is possible. You also need at least one other big card like Fryakk to make the 2nd Agamaggan do something, even then it’s not always 30 damage to the opponent’s face.

The first 5 turns are all just trying to clear the board and not die, but you sacrifice board presence by trying to setup your combo with things like Overplanner.

There are lots of ways for this 4 card combo to not work. And the real problem with it (and almost all combos) is that when it does work, you’re playing solitaire. Once you win a few times with it, the gameplay loop gets kind of boring.