Akros, the Midnight Scourge

Flying
Whenever Akros, the Midnight Scourge enters
the battlefield, reveal the top 5 cards of your
library. You may put any number of instant,
sorcery, or dragon spells from among them into
your hand. Put the rest on the bottom of your
library in any order.
Instant and sorcery spells you cast cost {1} less
to cast for each dragon you control.