Can you play Stupefy or Discipline without targeting a unit, just to draw a card?

Ruling: No, you cannot cast Stupefy or Discipline without a valid target just to draw a card. You need a valid target to exist in order to cast the spell and put it on the chain.

Nuances:

• Once a spell is on the chain and resolving, it skips what it can't do if the target no longer exists or isn't valid anymore, but you still need a valid target at the time of casting.