Sliver creatures you control have “Whenever this creature deals combat damage to a player, exile the top card of your library. You may play that card this turn.”
They hunt on pure instinct, driven by the will of the hive mind with no time wasted on independent thought.
You must pay all costs and follow all normal timing rules for cards played this way. For example, you may only play a land from exile this way during your main phase while the stack is empty, and only if you haven't played a land yet this turn.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.