Seismic Assault

• WWizards of the Coast2018-12-07
  Official Ruling
  If an effect instructs you to draw cards and then discard cards, you can't take actions in between. For example, if you have no cards in hand and cast Faithless Looting, you can't activate Seismic Assault's ability between the time you draw two cards and discard those two cards.

Rulings via Scryfall