Legendary Creature â Insect Shaman
Whenever a player sacrifices another permanent, put a +1/+1 counter on each creature you control.
Mazirekâ€™s last ability is a triggered ability, not an activated ability. It doesnâ€™t allow you to sacrifice a permanent whenever you want; rather, you need some other way of sacrificing permanents.
If you sacrifice Mazirek and other permanents at the same time, Mazirekâ€™s last ability triggers for the other permanents.
If you sacrifice a permanent as part of casting a spell or activating an ability, Mazirekâ€™s last ability will resolve before that spell or ability.
A legendary permanent that is put into a graveyard because of the â€œlegend ruleâ€ isnâ€™t sacrificed.
Mazirek itself doesnâ€™t allow any player to sacrifice any permanents. Its ability triggers whenever a player sacrifices a permanent because some other spell, ability, or cost instructed the player to do so.
If a permanent is sacrificed to pay a cost of a spell or ability, Mazirekâ€™s ability will resolve before that spell or ability. Conversely, if a permanent is sacrificed during the resolution of a spell or ability, that spell or ability will finish resolving before Mazirekâ€™s ability is put onto the stack.
A legendary creature that dies because of the â€œlegend ruleâ€ isnâ€™t sacrificed.
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