Gravekeepers Majesty

As an additional cost to cast this spell sacrifice up to
three target creatures.

If you sacrificed one or more creatures, put that
many +1/+1 counters on Gravekeepers Majesty.
If you sacrificed 2 or more creatures put a vigilance
and trample counter on Gravekeepers Majesty.
If you sacrificed 3 creatures destroy an amount of creature cards equal to their combined mana value divided by three, rounding down.