Commander creatures you own have "Whenever an artifact or creature you control is put into a graveyard from the battlefield, each opponent loses 1 life."

Whenever an enchantment you control is put into a graveyard from the battlefield, each opponent loses 1 life.

Flying

Harbinger of Despair — Whenever this creature or another nontoken artifact you control is put into a graveyard from the battlefield or is put into exile from the battlefield, target opponent loses 1 life and you gain 1 life.

Whenever an artifact is put into a graveyard from the battlefield, you may have target opponent lose 1 life.

Whenever an artifact is put into a graveyard from the battlefield, you may put a +1/+1 counter on this creature.

Whenever this creature or another creature or artifact you control dies, target opponent loses 1 life and you gain 1 life.

Whenever another creature you control or a land you control is put into a graveyard from the battlefield, put a +1/+1 counter on target creature you control.

Whenever this creature or another creature you control dies, each opponent loses 1 life and you gain 1 life.

Menace (This creature can't be blocked except by two or more creatures.)

Whenever one or more artifacts and/or creatures you control are put into a graveyard from the battlefield, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Whenever a nontoken creature is put into your graveyard from the battlefield, create a 2/2 black Zombie creature token.

When a creature is put into an opponent's graveyard from the battlefield, exile this creature.

Deathtouch

Whenever another creature you control that has a hat enters or a hat sticker is put on a creature you control, each opponent loses 1 life.

Whenever a Goblin you control is put into a graveyard from the battlefield, you may put a +1/+1 counter on this creature.

When this artifact enters or is put into a graveyard from the battlefield, you draw a card and you lose 1 life.

This creature can't block.

This creature has haste as long as an opponent has 10 or less life.

Landfall — Whenever a land you control enters, you may return this card from your graveyard to the battlefield.

Rally — Whenever this creature or another Ally you control enters, each opponent loses 1 life and you gain 1 life.

Whenever another nontoken Elf is put into your graveyard from the battlefield, you may create a 1/1 green Elf Warrior creature token.

Flash

When this creature enters, choose target player. You create a tapped Powerstone token for each nonland card in that player's graveyard that was put there from the battlefield this turn. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")

Haste

Shadow (This creature can block or be blocked by only creatures with shadow.)

Whenever another creature is put into your graveyard from the battlefield, you may pay . If you do, return this card from your graveyard to the battlefield.