Salazar Vingaz, Guild Leason

When Salazar Vingaz, Guild Leason enters the battlefield, create two 1/1 black and green wurm
tokens.
{u/b}{u/b}, Sacrifice two other creatures: Look at target opponents hand, exile one of them face down.
You may look at and cast that card for as long as
it remains exiled, and you may spend mana as
though it were mana of any type to cast that spell.