Cheapest priced copy (Foundations Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Tome of Legends 
Artifact — Book · Rare · Throne of Eldraine · #332
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.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
7 printings · $0.49 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 332 | Rare | $0.59 | — |
| Foundations Commander | 293 | Rare | $0.49 | — |
| Final Fantasy Commander | 369 | Rare | $0.49 | $1.99 |
| Murders at Karlov Manor Commander | 246 | Rare | $0.59 | — |
| Marvel Super Heroes Commander | 223 | Rare | $0.49 | $0.49 |
| Marvel Super Heroes Commander | 454 | Rare | $0.79 | — |
| The List | ELD-332 | Rare | $1.49 | — |
One ruling from Wizards of the Coast
- 4 October 2019If 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.)