too many cards
too slow
only low hp units
no cc and no pc
reduce the number of soul catchers
drop the boneyards
either use an entropy mark without towers and just use 1 cat at a time. then 4 cats should be enough. or use pendulums and mix in a few skills: plague, pandemonium, anti matter, ... whatever you like. in that case choose the mark of death or entropy, depending on which quanta you use the most with your deck.
add weapons
give this a shot:
Hover over cards for details, click for permalink
4vl 4vl 4vl 4vq 4vq 4vq 4vq 52k 52k 52k 52k 52k 52k 52l 52l 52p 52p 52v 52v 52v 542 542 542 542 542 542 542 542 542 542 8pj
hope you have the weapons
.
that cat, vulture combo is just really slow and vulnerable. so imo discord helps the most to get you started.
skull shield to take less damage and get even bigger birds. plague and soul catcher should be clear.
just tested a few ideas vs lvl3, so feel free to make changes. this is probably not the best you can do with that combo.