Saverin Tashan, Aether Broker

Hexproof
Whenever Saverin Tashan, Aether Broker enters
the battlefield, you get {e}{e}.
{e}{e}: Each opponent exiles a card from their
hand. You may play the exiled cards for as long
as they remain exiled, and you may spend mana
as though it were mana of any color to cast spells
this way.