You are never forced to sacrifice any permanents. You can choose to discard your entire hand if your hand is smaller than the number of cards you are required to discard.
04-10-2004
wotc
You draw the cards, then sacrifice any permanents you want to sacrifice, then discard the required number of card from your hand. There is no chance to play any cards in between these actions.
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.