Kieoni, Huntmaster

At the beginning of your upkeep, if you lost life during the last turn, put a Tracking counter on Kieoni, Huntmaster.
Remove a Tracking counter: Kieoni, Huntmaster gains +2/+1 and First Strike until end of turn.
{t}, remove {x} Tracking counters: Target creature has {x} -1/-1 Counters.