You need to take Anton out of there, he is a weak card, so you are better of with something else.
Greem is better at deciding matches than Corvus. However Corvus does give you better possibilities for winning battles with his better power and nifty ability. They both makes good bluffs. Personally i use Greem as Corvus´ damage is on the low side.
I always prefer Tomas over Aylen. Aylen is just too obvious and since Skeelz have overall low damage if there's an Aylen in your hand your opponent's whole strategy will become "get rid of Aylen". I agree on Greem over Corvus, she is a great bluffer and if her poison does make it through your opponent is forced to hit you hard to make up for it. Corvus is better for bi-clans.