Learning Cub

Learning Cub has training as long as you control
a creature with greater power. (Whenever this
creature attacks with another creature with greater
power, put a +1/+1 counter on this creature.)
At the start of your upkeep, if Learning Cub has
the most power out of all creatures you control,
creatures you control have training until
Learning Cub leaves the battlefield or has less
power than creatures you control at the start of
your upkeep.