Syr Loyn, the Hungry

Devour 1 (As this creature enters the battlefield, you
may sacrifice any number of creatures. This creature
enters the battlefield with a +1/+1 counter on it for
each creature sacrificed this way.)
Syr Loyn, the Hungry has trample as long as it
devoured a creature.
Whenever damage dealt by a Knight you control
causes a creature to die this turn, put a +1/+1
counter on that Knight.