Alak-Hul, The Darkblade

"Alak-Hul, The Darkblade" enters the battlefield with X +1/+1 counters on it,
where X is equal to the number of swamps
you control.
Whenever "Alak-Hul, The Darkblade" is
dealt damage, remove a +1/+1 counter from
him and prevent all damage until next turn.