Kelsien, the Plague

one red mana one white mana one black mana Legendary Creature — Human AssassinPower and toughness2/2

Vigilance, haste

Altaïr, Brotherhood Mentor gets +1/+1 for each experience counter you have.

tap this permanent : Altaïr 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."

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Showing Commander 2020#11

Price

2.50 $

Foil 1.03 $

9 printings · up to 15.16 $

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Kelsien, the Plague rulings

2020-04-17
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.
2020-04-17
If the target of Kelsien's last ability dies before the ability resolves, you won't get an experience counter.
2020-04-17
If Kelsien leaves the battlefield, you keep any experience counters you've received.

Kelsien, the Plague keyword rules

Vigilance Rule 702.20

Vigilance is a static ability that modifies the rules for the declare attackers step.

Attacking doesn’t cause creatures with vigilance to tap. (See rule , “Declare Attackers Step.”)

Multiple instances of vigilance on the same creature are redundant.

Haste Rule 702.10

Haste is a static ability.

If a creature has haste, it can attack even if it hasn’t been controlled by its controller continuously since their most recent turn began. (See rule .)

If a creature has haste, its controller can activate its activated abilities whose cost includes the tap symbol or the untap symbol even if that creature hasn’t been controlled by that player continuously since their most recent turn began. (See rule .)

Multiple instances of haste on the same creature are redundant.