Omnipotence

Hexproof
You may play cards from outside the game that
you own. You cannot play a copy of a card
other than a basic land more than 4 times.
You may spend mana as though it were mana
of any color to cast spells. You can only have
1 copy of Omnipotence in your starting deck.
You cannot cast more than one copy of
Omnipotence per game.
If this permanent would leave the battlefield,
you lose the game.