always thought phoenixes were a waste, they take a card slot and only do 4 damage, as well as dying very frequently. Plus when all the games are under around, 10, lava golem usually does more. I always thought the 2 crawlers was for draw purposes.
The only thing about this is if the Monoaether can get up one phase shield, you're done, cause it dodges discord hits and has too many towers to suck up using only BHs. If I get frustrated enough, i add explosion, but it doesn't really help.