Battle Sphinx

At the Beginning of your upkeep, you
may have Battle Sphinx become an artifact
creature with flying until end of turn. If you do,
tap target Legendary creature you control. That creature gains indestructible until end of turn.
Whenever Battle Sphinx attacks, if it's attacking
an opponent with more creatures than you,
create a 2/2 white Knight creature token with vigilance.
Crew—4