I'm using a version of this deck to farm Half Bloods so I can get the money for a False God deck. I did add a Drain life in to deal with individual creatures. That has saved my skin a lot.
Half Blood Results (Unique Opponents)
First 10: 7-3, 3EM
First 25: 15-10, 8 EM
First 50: 32-18, 18 EM
Cards that will shut you down
1. Pandemonium: This will decimate your army of creatures and there is nothing you can do about it if your opponent has 3 Entropy Quanta. If you are draining quanta properly you should be able to prevent this though.
2. Otyugh: Dangerous alone but lethal if more than one is out on the field. Your only protection is to either use Drain Life, to deny all gravity quanta, or to have a neverending stream of tasty morsels so the loss of a few is minimally disruptive to your strategy.
3. Thorn Carapace: If you can't steal this, consider resigning the game. This will shut you down.
4. Flooding: Your only strategy is to steal this away and let it die off. Unfortunately, by the time you do this, you will have lost most of your creatures. You can come back from that but it is a lot harder.