Snowdrop the Blade Master

I don't know what i'm doing wrong but cant beat floor 16. I can build a deck with a ton of dmg, but there's a point in which hitting 5 cards of 12-25 dmg every turn is just not enough to kill before getting killed. Building defensive doesn't seem to work for me, as there is not enough good defensive options (besides the 50hp heal card, that one seems great). So i know i'm doing something wrong, just don't know what. should i don't spend the shards and grab the shard item on the reward screen? i don't know what that item does on the first place, also, losing card selections is kind of painful. Should i stack a ton of elemental combo? doesn't seem to increase the damage or something, and its very restrictive to try and only use one kind of elemental cards. Should i swap between elemental types to trigger some kind of special effect? doesn't seem to do anything too, but more testing is needed. So... i'm stuck, and lost, and don't know how to keep progressing, ill try to test the 3 strats i listed above and try to arrive to a solution by trial and error. But i know that something can be done, as one time, a card that deals 35 dmg, did around 100 dmg in 1 turn, so there's someth…