Siria of Capithallis

Flash, First Strike
When Siria is put into play, you can search in
your library for a Legendary Creature and put it
into play.
{w}: Siria gains +1/+0 and Double Strike until the
end of turn.
{10}: Siria gains +20/+20, Double Strike, Trample, Flying, Hexproof, Haste, Lifelink, Vigilance and Reach until the end of turn.
When Siria is put into a graveyard from the battlefield, return it into its owner library.