They did have something similar to a draft mode. It’s been a while since I played but you would build a deck from a series of options, usually 3 cards or 3 synergized subsets of cards, and this would repeat 15(?) times. Then when the deck is built you queue against other constructed decks.
People would just reset a run if their drafted deck didn’t come together.
I’m pretty sure the design intent was to make your first level of defense learning mechanics and using the dodge roll. If you can do that consistently you can just pump damage and speed, which is what everyone wants to do anyway.