Yu Shu Lien, the Dragon Blade

Heirloom (when this creature enters the battlefield,
you may search your library for an Heirloom card,
reveal it, put it into your hand, then shuffle.)
Yu Shu Lien, the Dragon Blade has bushido X,
where X is the number of attacking creatures.
(When this blocks or becomes blocked, it gets +X/+X
until end of turn.)
Partner (You can have two commanders if both have partner.)