in relation to joy and psycho, if the skill is based on the number of cards in hand, we should assume that it will be optimal at 6-7 cards, effective at 4-5 cards, and preform poorly at 3 or fewer cards.
for joy, the spell should rival, maybe even *very slightly* outperform, life's heal spell at the optimal level. as is i think it is a tad too powerful relative to heal.
i think capping psycho at 4 (basic) or 5 (upgraded) would bring it more in line with the atk bonuses already in place and not be overpowered at the most optimal card counts in hand