Tome of Legends
Artifact — Book
This artifact enters with a page counter on it.
Whenever your commander enters or attacks, put a page counter on this artifact.
, 
, Remove a page counter from this artifact: Draw a card.
Illustrated by
Throne of Eldraine#332RareEnglishLegality
Rulings
Oct 4, 2019
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.)