Luigi, Supportive Sidekick

When Luigi, Supportive Sidekick enters the battlefield or attacks, put a +1/+1 counter on
another target creature you control.
Whenever Luigi, Supportive Sidekick blocks,
becomes blocked, or becomes the target of a spell
or ability your opponent controls, put it on the
bottom of its owner's library.
When the going gets tough, don't expect any help.