Ripe for the Plunder

True Mastery {4}{r}{r} (If you control a full party,
you may cast this for its true mastery cost.)
Shuffle your library, then reveal cards from the
top of your library until you reveal an artifact
card. If this spell was cast for it's true mastery
cost, reveal up to four artifacts this way instead.
Then, you may cast the revealed artifacts without paying their mana cost. Put all revealed cards not
cast this way on the bottom of your library in a
random order.