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Simple enough. Do they stack. Both have an affect on arcane pool. But Mindblade says This ability replaces arcane pool, and counts as arcane
pool for the purpose of feats, abilities, and class features. And black blade says Instead of the normal arcane pool amount, the bladebound magus's arcane pool has a number of points equal to 1/3 his level (minimum 1) plus his Intelligence bonus. This ability changes the Arcane Pool class feature and replaces the magus arcana gained at 3rd level.
I know archtypes can't stack if they both alter the same class ability but this one is kind of tricky. Mindblade turns the arcane pool into a psychic pool. But black blade only limits the number points in the pool.
Unfortunately, because they both change the same parent class feature (In any way!) they are not compatible.