Devastation Sliver

Devastation Sliver enters the battlefield with {5}+{x} emerge counters on it.
At the beginning of your upkeep remove 1 time counter from Devastation Sliver.
At the beginning of your upkeep if Devastation Sliver has no emerge counters on it, destroy all non slivers to their owners hands.
{3}: Put {x}+3 time counter on Devastation Sliver where {x} is the number of mana used to activate this ability. Any player may play this ability.