Cost: 6000 DEC (~6 USD). Effect: Daily random bonus reward. Possibilities: Crap card, good card, beta pack, essence orb and amazing summoner.
Day 1 - Essence Orb. Eletric Eels for rare. Around $0.80 in total value.
Day 2 - Beta Pack. Medusa for rare, Swamp Thing for epic. Around $1.2 in total value.
Satisfied with the potion? Yes, mildly. Got $2 out of $6 back so far. I'll probably get a $0.02 Mech Goblin tomorrow to compensate... Whatever, it's part of gambling, I guess. Who knows? I might get the ultimate summoner card.
Fire splinter just got very interesting to me yesterday. I've realized focusing on sneak attacks is awesome with it. Elaborating a strategy around that should be very fun.