Pyra, Flame of The Aegis

Haste,Trample,Deathtouch,Vigilance
{r},{t}: Destroy target permanent
{r}{r}{r}{r}{r},{t}: Destroy all of target opponent's permanents
If Mythra, Light of The Aegis is in your hand, you may replace this card with it.
Smash attack(Burning Sword)-{10}: Deal 10 damage to any target. If it was a creature and it would go to the graveyard, exile it instead. Create a 5/5 Legendary creature token with vigilance called Rex. If there is already a Rex creature token in play, put 5 +1/+1 counters on Pyra, F