Tiamat, The Dark Lady

Double Strike, Flying, Menace, Trample, Ward {3}
{1}{b}{b}{r}{r}: Tiamat, The Dark Lady deals 5
damage to any target.
Whenever a dragon enters the battlefield under
your control, put a +1/+1 counter on Tiamat,
The Dark Lady. Dragons you control gain
+X/+X, where X is the number of Dragons
you control.