Plasma joker:
literally plasma deck's deck effect but joker version, it's more strong because it can be reorganised so you can choose when it activates.
Negative card joker (I'm bad at naming things):
At the start of a round it makes a copy of a random card in your deck but the copy is negative (so like if you have a steel king of hearts it becomes a negative steel king of hearts). The negative will basically mean "increase hand size when this card is in hand" (so the same as perkeo but hands not consumable slots)