Silent-Blade Shinobi

Whenever this creature deals combat damage
to a player, that player creates an emblem with
"At the beginning of your upkeep, this emblem
deals 1 damage to you." Remove that emblem
from the game at the beginning of that player's
next end step.
Whenever this creature deals combat damage to
a creature, that creature gets -1/-1 until your
next turn's end step