Norn's Command

Choose two --
- Put a +1/+1 counter on each creature you
control.
- Put two -1/-1 counters on each creature
with power 4 or greater.
- Return target artifact creature card from your graveyard to the battlefield with a +1/+1 counter
on it.
- Proliferate. (You choose any number of permanents and/or players with counters on them, then give each another counter of a kind already there.)