the gempalm incenarater is for the kill, any cycling card will do.
Library of leng
You have no maximum hand size limit. If a spell or ability forces you to discard a card, you may discard that card to the top of your library instead. (Second half is key.)
Fluctuator
Cycling costs you up to 2 less to play. (most cycle costs 2)
(Cycling)
Discard this card from your hand, draw a card. (when you discard to cycle, put the card on top of your Library)
You see a cycle here? Add any other effect that triggers upon cycling or discard or draw and you have something neat.
Spiderman - you are right, I don' know what I was thinking. It don't return squat. Just removes it temporarily. But it doesn't matter cuz you just do it again next turn.