King of the Nile

Cursed: Lose two life when King of the Nile
enters the battlefield.
Curse 2: {t}, {b}{b} Target creature or planeswalker
takes 2 damage or receives a -2/-2 counter.
If Queen of the Nile is also played, King of the
Nile gains +2/+2. If the queen is destroyed,
remove the counter and the king gains double
strike until end of your next turn