March of the Swordmaster

March -- At the beginning of your upkeep, if you control three or more creatures that share a creature type with March of the Swordmaster,
put a day counter on it.
Remove three day counters from March of the Swordmaster and sacrifice it: Create a 2/2 white Human Knight creature token with "Knights you control have double strike and lifelink."
"To defend mother life... Ride! Die! Sacrifice!"