Wilhelt, the Rotcleaver [Innistrad: Midnight Hunt Commander] Fire[+30] Sacrifice another creature: Yahenni gains

Sacrifice another creature: Yahenni gains indestructible until end of turn

Set: Commander 2019 Type: Creature — Zombie Wizard Rarity: Rare Cost: {4}{B} Whenever you discard a creature card

Set: Sun & Moon: Crimson Invasion Type: Fighting Rarity: Ultra Rare Retreat cost: Colorless

Set: Commander 2016 Type: Legendary Artifact Creature — Human Rarity: Mythic Cost: {1}{U}{B} Deathtouch

then negate its effect is the activation timing is incorrect

Wilhelt, the Rotcleaver [Innistrad: Midnight Hunt Commander] Fire[+30] Sacrifice another creature: Yahenni gainsSet: Innistrad: Midnight Hunt Commander Type: Legendary Creature Zombie Warrior Rarity: Mythic Cost: {2}{U}{B} Whenever another Zombie you control dies, if it didn't have decayed, create a 2 2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.) At the beginning of your end step, you may sacrifice a Zombie. If you do, draw a card.