Vahre, Zegana's Opus

At the beginning of your upkeep, put X +1/+1 counters on Vahre, Zegana's opus, where X is the number of creatures on the battlefield with a greater power than Vahre, Zegana's Opus.
Remove a +1/+1 counter from Vahre, Zegana's Opus: Vahre, Zegana's Opus gains your choice of flying, First Strike or Vigilance until end of turn.