Two ideas popped in my mind recently :
1) Last Stand/Last Hope (permanent costing 5/4 :light ) : While this is in play, if you have less than 1/4th of your max HP,
your creature with the highest HP gains gravity pull. If it dies, the one with the second highest HP immediatly gains gravity
pull, ect till you have no more creatures. If you have more than 1/4th of your max HP, you lose 1HP for each light creature
on your side of the field.
2) Brain shuffle/Brain puzzle (permanent costing 5/7 :entropy) : As long as this is in play, at the end of each turn, the player
who just played shuffles his hand into the deck and picks the same number of card he had in his hand before the shuffle.
(upgraded : the effect only affects your opponent)
Thoughts?