Jon, Veteran Instructor

Eminence — As long as Jon, Veteran Instructor is
in the command zone or on the battlefield,
whenever a creature you control levels up, it
gets a +1/+1 counter.
Creatures you control have Level up {2} ({2}: Put
a level counter on this. Level up only as a
sorcery.)

The allies of Zendikar will be ready for anything.