不浄なる者、ミケウス

威嚇
人間が１体あなたにダメージを与えるたび、それを破壊する。
あなたがコントロールしていて人間でない他のクリーチャーは、＋１/＋１の修整を受け不死を持つ。（不死を持つクリーチャーが死亡したとき、それの上に＋１/＋１カウンターが置かれていない場合、それを＋１/＋１カウンターが１個置かれた状態でオーナーのコントロール下で戦場に戻す。）

Mikaeus, the Unhallowed

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)
Whenever a Human deals damage to you, destroy it.
Other non-Human creatures you control get +1/+1 and have undying. (When a creature with undying dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Commander Masters

Intimidate
Whenever a Human deals damage to you, destroy it.
Other non-Human creatures you control get +1/+1 and have undying. (When a creature with undying dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Once a servant of the light, now a slave to the dark.

Secret Lair Drop

Any damage dealt to you by a Human will cause Mikaeus’s ability to trigger, including noncombat damage dealt to you by a Human and damage dealt to you by a Human you control.

If a Human deals damage to you at the same time that Mikaeus is dealt lethal damage, Mikaeus’s triggered ability triggers. That Human will be destroyed even though Mikaeus has left the battlefield.

If a non-Human creature you control without a +1/+1 counter dies at the same time as Mikaeus, that creature’s undying ability granted by Mikaeus triggers and will return it to the battlefield.

The +1/+1 bonus that Mikaeus gives to other non-Human creatures you control isn’t a counter. It won’t prevent undying from triggering.