Yog-Sothoth, the All in One

When Yog Sothoth enters the battlefield, you may discard your hand and draw 7 cards.
Whenever an opponent casts a spell, they may pay {2}. if they do not, you may draw a card.
Instants and sorceries you cast cost {1} less to cast.
{1}{p/u}{p/r}: You have no maximum hand size until the end of the turn.