Leyline of the Aetherstorm

If Leyline of the Aetherstorm is in your opening hand, you may begin the game with
it on the battlefield.
Whenever a player casts an instant or sorcery, that player flips a coin. If they win, Leyline of the Aetherstorm deals 1 damage
to a target of their choice. If they lose,
Leyline of the Aetherstorm deals 1 damage
to them.