Syr Konrad, the Grim

Mana cost: {3}{B}{B}
Type: Legendary Creature — Human Knight
Power / toughness: 5 / 4
Set: Duskmourn: House of Horror Commander #158 (uncommon)
Price: $1.52 USD

Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad deals 1 damage to each opponent.
{1}{B}: Each player mills a card. (They each put the top card of their library into their graveyard.)

Syr Konrad, the Grim has 11 printings, first in Throne of Eldraine (2019). EDHREC ranks it #267 among Commander cards. It appears most in The Wise Mothman decks (17,599 on EDHREC). 5 public decks on TCG run it. It has 2 official rulings.

Legality

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

Public decks that run Syr Konrad, the Grim

Cavalry Charge - March of the Machine Commander, led by Sidar Jabari of Zhalfir
Endless Punishment - Duskmourn: House of Horror Commander, led by Valgavoth, Harrower of Souls
Graveyard Overdrive - Modern Horizons 3 Commander, led by Disa the Restless
Revenant Recon - Murders at Karlov Manor Commander, led by Mirko, Obsessive Theorist
Sneak Attack - Zendikar Rising Commander, led by Anowon, the Ruin Thief

Commanders that run Syr Konrad, the Grim most

Deck counts from EDHREC.

The Wise Mothman: 17,599 decks
Teval, the Balanced Scale: 15,538 decks
Valgavoth, Harrower of Souls: 12,746 decks
Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel: 12,691 decks
Sidar Jabari of Zhalfir: 10,910 decks
Meren of Clan Nel Toth: 10,027 decks
Muldrotha, the Gravetide: 9,680 decks
Teysa Karlov: 9,541 decks

Often played with Syr Konrad, the Grim

Cards that show up in the same decks on EDHREC.

Rulings

2019-10-04: If one or more creatures die at the same time as Syr Konrad, its first ability triggers for each of those creatures.
2019-10-04: In a Two-Headed Giant game, Syr Konrad's first ability causes it to deal 1 damage twice.