Pekmai, Painter of Spring

Substantiate —Whenever Pekmai, Painter of Spring becomes tapped, if it's not attacking and you have no cards in hand, at the beginning of your next main phase, draw a card and add {u}{u}.
{2}{u}, {t}, Discard a card: Each player discards their hand, then draws cards equal to the greatest number of cards a player discarded this way.