The Grand Scheme

Creatures you control have dexterous.
(As long as those creatures have power and toughness equal to their base power and toughness, they cannot be blocked)
At the beginning of your upkeep, you may look
at the top card of your library, then if it is an artifact with converted mana cost 4, you may sacrifice The Grand Scheme and put it onto the battlefield. Otherwise, put that card on the bottom of your library and shuffle it.