Cowardice
3UU Enchantment Mercadian Masques Rare
Whenever a creature becomes the target of a spell or 
ability, return that creature to its owner's hand.


Rhystic Deluge
2U Enchantment Prophecy Common
U: Tap target creature unless any player pays 1.


The synergy here is really obvious, so I don't think 
its needs any explaining.  A powerful creature control 
engine that can lock down most games.  Just remember 
that Cowardice's ability still triggers even if your 
opponent pays the 1.


It's also really fun to bounce your own creatures that 
have cool CIP abilities.  Try out Ravenous Rats, 
Highway Robber, Scrivener, and Crypt Angel.