Echoing Alarm

Echoing Alarm enters the battlefield with three pack counters on it.
Whenever a Beast you control is dealt damage you may remove a pack counter from Echoing Alarm. If you do, create a 3/3 green Beast creature token.
When Echoing Alarm has no pack counters on it, sacrifice it. If you do, Beasts you control gain Trample and Haste until the end of turn.