The Fearsome Flock (UNK-RU04C) [Unknown Event]

Flying, split second level up {2} ({2}: Put a level counter on this. Level up only as a sorcery. This can't be responded to.)
LEVEL 1-3
3/3
Flying
Whenever The Fearsome Flock deals combat damage to a player, gain control of target noncreature artifact that player controls. It becomes a Treasure.
LEVEL 4+
3/4
Flying
You may activate abilities of artifacts your opponents control as though you control them.