The majority of the deck consists of creatures, so it is very susceptible to board wipes
Remember that most of these things are subjective and this is just my opinion, so feel free to disagree (but you will be wrong)
Proteus Machine can be a good bluff or just a free creature
And in addition to all that lovely synergy, Kumena's effects scale really well, drawing cards when the board is small, adding +1/+1 counters to a team that's wide, and growing more and more powerful as you play late game cards like Seedborn MuseSeedborn Muse
A recent article names his Manga Parallel Art version as possibly the highestvalued card at time of writing
I'll break down the top cards worth opening, along with a few honorable mentions worth keeping an eye out for