Maelstrom Saber

(Weapons have "{t}: This deals damage equal to its
power to any target. If a creature is dealt damage this
way, it deals damage to you equal to its power. Then,
remove a durability counter from this and send it to
the graveyard if it has none left.")
Whenever Maelstom Saber deals damage, reveal
cards from the top of your library until you
reveal a card that costs 4 or less. You may play it without paying its mana cost. Put the rest on the bottom of your library in any order.