Flying, Hexproof

{X}{W}{U}{B}{R}{G}{T}On attacking return creatures from all graveyards, tapped and attacking, {X} is the total number of exiled creatures. At your end step, exile all the creatures attacking this turn with Samm is your best hope.

{W}{U}{B}{R}{G} {T} Return exiled creatures to their owner's library and suffle them.