Lost Gearhulk

Lost Gearhulk has your choice of either Vigilance, Flash, Menace, First Strike, Trample (this remains the same for as long as Lost Gearhulk is on the battlefield)
When Lost Gearhulk enters the battlefield, you may exile three target creatures, if you do, Lost Gearhulk gets {x} -1/-1 counters, where {x} is the highest converted mana cost among creatures exiled this way. if you don't, put 5 -1/-1 counters on Lost Gearhulk