Only other possibilities for obtaining nearly any card is Lilith's shop which sells random cards individually and the blackjack victory booster which supposedly has any card.
Judging from the other comments I read there's apparently a very crashy boss fight tied to that card. Just using it a few times won't trigger the arrival of the fight where you practically can't let the boss take a turn or else the game will crash though. If you intend to use the card more than 4 times/gain 10k height though be prepared for the possibility of being ambushed by the boss then.