Valix'Uran, The Burning Sky

Eminence— At the beginning of your upkeep, if
Valix'Uran, The Burning Sky is in the command
zone or on the battlefield, you may reveal a
Dragon card from your hand. If you play that
card this turn, it has cascade. Dragons that enter
the battlefield this turn have haste.
Flying, protection from blue and from green
Dragon spells you control can't be countered.