The Master Sword

The Master Sword can only be equipped by a creature with toughness 10 or greater.
Equipped creature gains +5/+0 and has
Double Strike and Vigilance.
Whenever equipped creature deals damage,
look at the top card of your library. If it's a creature card with toughness 5 or greater, you may play it
without paying its mana cost, otherwise draw
that card.
EQUIP: Pay 5 life