Sandman's Bane

When Sandman's Bane enters the battlefield and attacks, up to two target creatures gain Sleep 2.
Whenever another creature awakes, that creature gains -1/-1 counters instead of +1/+1 counters
Sandman's Bane's power and toughness equal to the number of creatures asleep on the battlefield.
Those who do not heed the warnings of the Nightmare Weaver's lesser nightmares are assaulted with his trademark Night Mare