Kithkin Battleaid

While choosing targets as part of casting a spell or activating an ability, your opponents must choose at least one Flagbearer on the battlefield if able.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)
Sacrifice Kithkin Battleaid, target creature gains persist until end of turn.