four souls card sleeves The Binding of Isaac: Compatible Sleeve Bundle (8810 x 4) Compatibility claims only extend to the physical size of the cards in each respective game and no claim to endorsement or authorization by the respective rights holders is expressed or implied by Sleeve Kings The Binding Of Isaac: Four

You cant buy them with real money, but there are a few ways to earn them, mostly through battling

Foil bleed was observed on some secret rares (visible on card edges)

Having a counterspell here would be more versatile and probably helpful

I don't like doing crossover grading as it gives the grader a barometer of what to grade it as without the mystery element but there is some risk there

None of those are effectively priced at 2 mana, but access to all three modes of these practical tools at the same time is a level of flexibility that cant be overlooked

The two you can't companion are Yorion, Sky Nomad and Lutri, the Spellchaser