Jodah, the Demonstrator

Prowess
Instant and Sorcery spells you cast with mana
value 5 or more have Demonstrate. (The spell gains,
"When you cast this spell, you may copy it. You may
choose new targets for the copy. If you do, choose an opponent. That player copies the spell and may choose
new targets for the copy.)
Whenever you Demonstrate an Instant or Sorcery
spell, you may choose to do so for any number of opponents.