Yellowbear

Commander ninjutsu {1}{u}{b}
Whenever a Bear you control deals combat
damage to a player, proliferate.
All Bears are Ninjas in addition to its other types
and have ninjutsu {x}, where X is equal to the
converted mana cost as long as Yellowbear is on
the battlefield or in your command zone.
{p/g}{p/g}:Transform Yellowbear.