Im actually considering a few discard based effects and hand size alterations based as a small set.
Consider this Spell
White Elephant
1
put this card in your opponents hand, if discarded take damage equal to the number of cards in your hand (7)
by itself, not so much, but it prevents drawing if they had 7 cards, if they discard it, they lose HP, so they want to give it back, but if they dont have Darkness, its a trap.