Joker's Knight

Offering, Shroud
{t}:Put target creature mana value 4 or less from
your library into your graveyard, then shuffle.
The next creature spell you cast with Offering
costs {x} less to cast. X is equal to the targets
mana value.
At the beginning of your end step, if this and a creature mana 4 or less are in your graveyard,
you may shuffle this into your library and
put the other into your hand.