Kelsien, the Plague

Legendary Creature — Human Assassin    (CMC:3)

Vigilance, haste Kelsien, the Plague gets +1/+1 for each experience counter you have. : Kelsien deals 1 damage to target creature you don't control. When that creature dies this turn, you get an experience counter.

"Aim for an eye. Better they never see you."

011 C20 • ENChris Rallis

™ & © 1993— Wizards of the Coast

Notes: TODO: Update Copyright

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Kelsien, the Plague {R}{W}{B} Legendary Creature — Human Assassin Vigilance, haste Kelsien, the Plague gets +1/+1 for each experience counter you have. {T}: Kelsien deals 1 damage to target creature you don't control. When that creature dies this turn, you get an experience counter. 2/2

---

View this MTG card on Gatherer

4/17/2020
Each time Kelsien’s last ability resolves, it creates a separate delayed triggered ability. If you untap Kelsien and activate its last ability multiple times in one turn, they’ll each trigger when the appropriate creature or creatures die. 
4/17/2020
If the target of Kelsien’s last ability dies before the ability resolves, you won’t get an experience counter.
4/17/2020
If a player’s commander would die and that player spares it by sending it to the command zone instead, Kelsien’s delayed triggered ability won’t trigger.
4/17/2020
If Kelsien leaves the battlefield, you keep any experience counters you’ve received.

---

Card Kelsien, the Plague is not on TCGPlayer.