this is more of a deffensive combo

samite elder 2W
tap: creatures you control gain protection from the color(s) of target
ermanent you control until end of turn

tidal visionary U
tap: tidal visionary becomes the color of your choice until end of turn

if your running a blue white beatdown or you need some type of deffense say
against a fires deck this is a good combo.  just tap the tidal visionary for
the color of creature that is attackin then block and give protection from
that creature with the tidal visionary.  you can do this with anythin not
just tidal visionary but tidal visionary works nice because it's only costs
one blue mana to play.