Bandit, Fearless Fighter

Empower (Whenever this creature attacks with two
or more other creatures, put a +1/+1 counter on it. It
becomes empowered for the rest of the game if it is not
already empowered.)
At the beginning of your end step, if you control
a creature named Loki, Faithful Friend, both
Bandit and Loki become empowered for the rest
of the game if they are not already empowered.
Then, put a +1/+1 counter on Bandit and Loki if
both creatures are empowered.