I believe some of the unique sleeve effects are too weak to consider compared to the other sleeves, and also have a tendency towards having great downsides without equally good upsides. My suggestions, which do increase the average power level, are as follows:
Red Sleeve: +2 discard, -1 hand. I'm not happy with this one. I was struggling to find a good effect for this, as I wanted it to be distinct from the Blue Sleeve. This, Blue and Black Sleeve are my least favourite effects, as they feel like downsides. The other idea I had, bt scrapped because I believe it is infeasible to implement, is spare Discards persist for 1 Round. I don't believe the end of round state reset can be bypassed, though maybe you can record the number of discards at victory and award them at the star of the next round.
Blue Sleeve: Convert all Discards to Hands. This would be synergistic with things like Wasteful Voucher and trigger before Burglar.
Yellow Sleeve: This one seems in a good state and adds an interesting effect to the deck.
Green Sleeve: +$1 per remaining hand/discard. Interest is now negative. I think this one is just fun, as it incentivises spending hard and fast. To the Moon and Interest Vouchers would be anti-synergistic. I probably haven't made full use of the current effect yet.
Black Sleeve: Make a random Joker Negative every 2 Antes. The current effect feels like a strict downgrade, and this feels like it matches the spirit of the deck.
Magic Sleeve: I think this sleeve is in a good state.
Nebula Sleeve: Observatory Voucher. First Celestial Pack is free. This one isn't necessary, but I thought it might be interesting to include.
Ghost Sleeve: I think this sleeve is in a fantastic state. The benefit is great, and very interesting.
Abandoned Sleeve: Face Cards never appear. Face synergy Jokers also never appear. This would remove jokers like Baron, Triboulet, Smiling Face, Pareidolia, but not Ride the Bus. I think this would make the deck more interesting, as now it doesn't include dead jokers.
Checkered Sleeve: This could go one of two ways. Either build in the Smeared Joker effect to the Sleeve (and possibly remove it from the pool), or exclude Diamond and Club Jokers from the joker pool, alongside the card pool. Both effects would be interesting, though the first one will give higher highs and lower lows, due to the Suit debuff bosses.
Zodiac Sleeve: The effect seems good and fun. In fact, it is probably better than I am giving it credit for.
Painted Sleeve: I think it would be cool to show the next 1 (or 2) cards in the draw pile. This effect already exists through Misprint Joker tech, and is reminiscent of Frozen Eye from Slay the Spire, a relic I adored. The current effect is OK, though adding a downside feels weird, as the benefit isn't that good.
Anaglyph Sleeve: The effect is very good and in a good and interesting place. It amplifies the direction of the deck.
Plasma Sleeve: I think this effect is quite bland. A cool effect might be to convert Chips to Mult. This would allow greater synergy with xMult like Glass cards, and Jokers, though I understand if this one is undesirable. The current effect is sufficient, as the cheaper vouchers is quite good.
Erratic Sleeve: This seems in a good state. If you move forward with the Plasma Sleeve changes, you might consider randomising the Shop prices as-well to really lean into the RNG element.
I'd like to finish by saying that this is a very fun mod, that adds a lovely element to the game. It doesn't feel unbalanced and makes runs more interesting.
I believe some of the unique sleeve effects are too weak to consider compared to the other sleeves, and also have a tendency towards having great downsides without equally good upsides. My suggestions, which do increase the average power level, are as follows:
Red Sleeve: +2 discard, -1 hand. I'm not happy with this one. I was struggling to find a good effect for this, as I wanted it to be distinct from the Blue Sleeve. This, Blue and Black Sleeve are my least favourite effects, as they feel like downsides. The other idea I had, bt scrapped because I believe it is infeasible to implement, is spare Discards persist for 1 Round. I don't believe the end of round state reset can be bypassed, though maybe you can record the number of discards at victory and award them at the star of the next round.
Blue Sleeve: Convert all Discards to Hands. This would be synergistic with things like Wasteful Voucher and trigger before Burglar.
Yellow Sleeve: This one seems in a good state and adds an interesting effect to the deck.
Green Sleeve: +$1 per remaining hand/discard. Interest is now negative. I think this one is just fun, as it incentivises spending hard and fast. To the Moon and Interest Vouchers would be anti-synergistic. I probably haven't made full use of the current effect yet.
Black Sleeve: Make a random Joker Negative every 2 Antes. The current effect feels like a strict downgrade, and this feels like it matches the spirit of the deck.
Magic Sleeve: I think this sleeve is in a good state.
Nebula Sleeve: Observatory Voucher. First Celestial Pack is free. This one isn't necessary, but I thought it might be interesting to include.
Ghost Sleeve: I think this sleeve is in a fantastic state. The benefit is great, and very interesting.
Abandoned Sleeve: Face Cards never appear. Face synergy Jokers also never appear. This would remove jokers like Baron, Triboulet, Smiling Face, Pareidolia, but not Ride the Bus. I think this would make the deck more interesting, as now it doesn't include dead jokers.
Checkered Sleeve: This could go one of two ways. Either build in the Smeared Joker effect to the Sleeve (and possibly remove it from the pool), or exclude Diamond and Club Jokers from the joker pool, alongside the card pool. Both effects would be interesting, though the first one will give higher highs and lower lows, due to the Suit debuff bosses.
Zodiac Sleeve: The effect seems good and fun. In fact, it is probably better than I am giving it credit for.
Painted Sleeve: I think it would be cool to show the next 1 (or 2) cards in the draw pile. This effect already exists through Misprint Joker tech, and is reminiscent of Frozen Eye from Slay the Spire, a relic I adored. The current effect is OK, though adding a downside feels weird, as the benefit isn't that good.
Anaglyph Sleeve: The effect is very good and in a good and interesting place. It amplifies the direction of the deck.
Plasma Sleeve: I think this effect is quite bland. A cool effect might be to convert Chips to Mult. This would allow greater synergy with xMult like Glass cards, and Jokers, though I understand if this one is undesirable. The current effect is sufficient, as the cheaper vouchers is quite good.
Erratic Sleeve: This seems in a good state. If you move forward with the Plasma Sleeve changes, you might consider randomising the Shop prices as-well to really lean into the RNG element.
I'd like to finish by saying that this is a very fun mod, that adds a lovely element to the game. It doesn't feel unbalanced and makes runs more interesting.