Mindlink Dragon

Flying, menace, haste
Link {0} (You may cast this card for it's link cost. If
you do, tap another creature you control, it doesn't
untap on any of its untap phases. If it leaves the battlefield or untaps for any reason, sacrifice Mindlink Dragon)
—Whenever Mindlink Dragon attacks, put a
+1/+1 counter on it. If its power is greater than
the linked creature or it isn't linked, draw a card.