Tiamat, Death Legends

Flying, haste, lifelink, deathtouch, prowess
Tiamat, Death Legends is not a creature unless
you control four or more other non-token dragon
creatures.
Tiamat, Death Legends's power and toughness
are equal to the number of non-token dragon creatures in play.
When Tiamat, Death Legends enters the battlefield, exile all Bolas creatures. This creature
gets +X/+X where X is the power of each Bolas
you exiled with this creature this turn.