Tiamat, Dragon Queen

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