Set:	Modern Horizons
Type:	Enchantment
Rarity:	Rare
Cost:	{2}{U}

As Mirrodin Besieged enters the battlefield, choose Mirran or Phyrexian.
Mirran Whenever you cast an artifact spell, create a 1/1 colorless Myr artifact creature token.
Phyrexian At the beginning of your end step, draw a card, then discard a card. Then if there are fifteen or more artifact cards in your graveyard, target opponent loses the game.