Drex, Titan of Sun's Serenity

When Drex, Titan of Sun's Serenity, enters the battlefield, sacrifice it unless it escaped.
Whenever Drex enters the battlefield or attacks,
create X 1/1 red and white warrior creature
tokens with haste, where X is 7 minus the
number of cards in your hand.
Escape —{r}{r}{w}{w}, Exile five other cards from
your graveyard. (You may cast this card from your
graveyard for its escape cost.)