Decided to give my take on this.
Swords: Reduce ranks up to 3 selected cards in hand by 1
Wands: Select 2 cards, copy rank and suit of left card onto right card
Cups: Enhance 1 selected card to Overgrown
Overgrown: When this card is discarded, increase its rank by 1
Pentacles: Select 3 cards, give them random enhancements
These ideas probably aren't that great but eh