I got really close, I managed to summon the boss and get it down to 300 hp, but I was out of gun cards unfortunately. I had way too many jump and teleport cards though.
If you use a lot of teleport cards, you can get more cards. Dynamite cards deal 100 damage on any enemy. When you use the teleport card in the boss fight, you get teleported to a random card spawn location. Try again later, if you have time to do it.
