Tome of Legends

This artifact enters with a page counter on it.
Whenever your commander enters or attacks, put a page counter on this artifact.
{1}, {T}, Remove a page counter from this artifact: Draw a card.

Murders at Karlov Manor Commander

Tome of Legends enters the battlefield with a page counter on it.
Whenever your commander enters the battlefield or attacks, put a page counter on Tome of Legends.
{1}, {T}, Remove a page counter from Tome of Legends: Draw a card.

The List

Throne of Eldraine

If you control another player's commander, you won't put a page counter on Tome of Legends when you attack with that creature. Similarly, if another player controls your commander, you'll still put a page counter on Tome of Legends if it attacks. (Perhaps the page is about your commander's shocking betrayal.)