Mazirek, Kraul Death Priest

Mana cost: {3}{B}{G}
Type: Legendary Creature — Insect Shaman
Power / toughness: 2 / 2
Set: Secret Lair Drop #1766 (mythic)
Price: $5.13 USD

Flying
Whenever a player sacrifices another permanent, put a +1/+1 counter on each creature you control.

Mazirek, Kraul Death Priest has 9 printings, first in Commander 2015 (2015). EDHREC ranks it #1,563 among Commander cards. It appears most in Dina, Essence Brewer decks (7,863 on EDHREC). 4 public decks on TCG run it. It has 4 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: not legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Mazirek, Kraul Death Priest

Plunder the Graves - Commander 2015, led by Meren of Clan Nel Toth
Plunder the Graves - Commander Anthology, led by Meren of Clan Nel Toth
Witherbloom Pestilence - Secrets of Strixhaven, led by Dina, Essence Brewer
World Shaper - Edge of Eternities Commander Deck, led by Szarel, Genesis Shepherd

Commanders that run Mazirek, Kraul Death Priest most

Deck counts from EDHREC.

Often played with Mazirek, Kraul Death Priest

Cards that show up in the same decks on EDHREC.

Rulings

2020-08-07: If you sacrifice Mazirek and other permanents at the same time, Mazirek's last ability triggers for the other permanents.
2020-08-07: If you sacrifice a permanent as part of casting a spell or activating an ability, Mazirek's last ability will resolve before that spell or ability.
2020-08-07: Mazirek's last ability is a triggered ability, not an activated ability. It doesn't allow you to sacrifice a permanent whenever you want; rather, you need some other way of sacrificing permanents.
2020-08-07: A legendary permanent that is put into a graveyard because of the "legend rule" isn't sacrificed.