sryda , the aroused

sryda enters the battle field with 10 slumber counters on it when ever another creature enters the battlefield
and removes a slumber counter from sryda .
as long as sryda has no slumber counters on it it has hexproof , undying and
{t}{{5}}{b}{g}{u}: until end of turn each creature you control has landfall for their enter the battlefield trigger.