This card + eternity?
Hey my oponent has no cards in his hand, lets bounce that dangerous creature and make him hand it over.
imagine a deck with flying pulv (or a butterflyed pest in 1.21), some pests to reduce his quanta, a PAed eternity and those cards in his hand.
Mark: Entropy
14 Quantum Towers
6 Siphon life
6 Butterfly effects
6 Quint
6 Pests
1 Photon
1 Upped Eternity
1 PA
6 of your card
6 immortal pests keep eating your quantum, while being able to destroy permanents for 3 ethropy (including your towers), when you finaly get important creatures out (and they aren't immortal) they get bounced until they are the last card in your hand, which is were you get forced to discard them. You'd end up sitting there seeing your entire field destroyed, just waiting for him to throw those siphons @ you, if your own creatures didn't kill you before that.