Hex Parasite is probably a bad idea, as it will completely hog your mana supply. You need to pay mana to get rid of counters that he put-on basically for free. Perhaps you are able to eat the counters, although animals will nevertheless hurt you with their base energy and will also be unable to cast anything significant for additional defense. Since you are speaing frankly about a G/R deck, you may not have countless black colored mana readily available often, and that means you typically spend life (Phyrexian mana) to cut back damage - therefore Hex Parasite is not just mana-intensive, it generally does not even help you save any life reduction. Hex Parasite is obviously an offensive utility animal, perhaps not protective.
A far greater strategy is always to merely beat upon your adversary much better than he does, or even attack Curse associated with Stalked Prey or perhaps the animals themselves, without which the Curse is useless. With Green/Red, you ought to be able to pursue both methods efficiently.
Green is known for having the ability to manage enchantments, and purple is good at destroying a lot of little animals with harm.
So basically your method should never let the adversary assaults gain any momentum. Put out some animals of your own, especially green ones, which will become more efficient ( = more power/toughness per expense) than your adversary's black and red people. If he handles to construct a big military due to a stalemate, create card benefit by sweeping the board clear of animals along with your red means (card benefit: you have got even more cards available and battleground combined than your adversary). If you simply want to decide on a straight harm battle, just make sure you get reduce the Curses with enchantment destruction.