Anowon, the Ruin Thief

Mana cost: {2}{U}{B}
Type: Legendary Creature — Vampire Rogue
Power / toughness: 2 / 4
Set: Secret Lair Drop #1568★ (mythic)

Other Rogues you control get +1/+1.
Whenever one or more Rogues you control deal combat damage to a player, that player mills a card for each 1 damage dealt to them. If the player mills at least one creature card this way, you draw a card. (To mill a card, a player puts the top card of their library into their graveyard.)

Anowon, the Ruin Thief has 5 printings, first in Zendikar Rising Commander (2020). EDHREC ranks it #9,847 among Commander cards. It appears most in Alela, Cunning Conqueror decks (1,690 on EDHREC). 1 public deck on TCG runs it. It has 4 official rulings.

Legality

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

Public decks that run Anowon, the Ruin Thief

Sneak Attack - Zendikar Rising Commander, led by Anowon, the Ruin Thief

Commanders that run Anowon, the Ruin Thief most

Deck counts from EDHREC.

Often played with Anowon, the Ruin Thief

Cards that show up in the same decks on EDHREC.

Rulings

2020-09-25: You draw just one card, no matter how many creature cards the player mills beyond the first.
2020-09-25: The player dealt combat damage mills cards only for the damage dealt by your Rogues, not for any other combat damage dealt to them at the same time.
2020-09-25: Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to other Rogues you control may become lethal if Anowon leaves the battlefield during that turn.
2020-09-25: If Rogues you control deal combat damage to two players at once, Anowon’s ability triggers twice.