Tiamat, Dragon Queen

Invincible, Vigilance, Haste, Trample, Flying,
Menace
When Tiamat, Dragon Queen enters the battlefield, you may search your library for 5
dragons and put them onto the battlefield.
Then, you may deal twice {x} damage to {x}
targets.
All dragons you control have Haste and Trample.
Tiamat's power and toughness are equal to your
life total.