mutants are the perm control for the deck, play accordingly, quint the elf and use the 2nd alfalfa on your own 2nd oty, mutate your cells and hope for a destroy or steal.
Tips:
1) watch your death quanta and cards left in deck, I usually make it a rule to stop drawing with hourglasses at 10 cards left.
2) Know who to quint. Different FGs take different strategies, so you need to know which 2 creatures to quint and what win-condition you are going to use. Some FGs fall to the fractal/condor/firestorm, some fall to mutant swarm
3) Don't be impatient. You have 99 hps to protect you from death, most games, you will sacrifice most of them, miracle, sacrifice yet more, and maybe miracle again before the win. Play only the cards necessary and don't take risks. The deck takes a beating the whole game, then delivers the KO punch, so don't worry about getting hurt, just make sure you don't die.
4) don't be afraid to improvise. Many games I have won have been because I was willing to sacrifice key cards for just one more turn. Maybe you need to drop a single condor and bonewall with nothing out, just because you know the condor will die, the bonewall will block 9 creatures, and you can miracle the next turn. Even without the condor, you still have the mutant swarm as a fallback.
Like I have said in the past, this deck requires PERFECT execution most of the time. A single mistake in judgment on your part becomes death. This is why, in my opinion, it is fun to play, because it keep me thinking on my feet. From my experience, the win rate is close to 60% when considering only games in which I made no tactical errors.
