Cheapest priced copy (The Brothers' War Retro Artifacts): $0.49 at Card Kingdom, near mint, their price list as of .
Mazemind Tome 
Artifact — Book · Rare · Core Set 2021 Promos · #232p
{T}, Put a page counter on this artifact: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
{2}, {T}, Put a page counter on this artifact: Draw a card.
When there are four or more page counters on this artifact, exile it. If you do, you gain 4 life.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
11 printings · $0.49 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Retro Artifacts | 30 | Rare | $0.49 | $0.79 |
| The Brothers' War Retro Artifacts | 93 | Rare | $1.29 | $1.49 |
| The Brothers' War Retro Artifacts | 93z | Rare | — | — |
| Commander Masters | 959 | Rare | $0.49 | — |
| Foundations Commander | 268 | Rare | $0.49 | — |
| Foundations | 676 | Rare | $0.59 | — |
| Core Set 2021 | 232 | Rare | $0.49 | $0.79 |
| Core Set 2021 | 383 | Rare | $0.69 | $0.99 |
| The List | M21-232 | Rare | $0.49 | — |
| Core Set 2021 Promos | 232p | Rare | $0.49 | $0.79 |
| Core Set 2021 Promos | 232s | Rare | — | $1.29 |
One ruling from Wizards of the Coast
- 23 June 2020If Mazemind Tome leaves the battlefield while its triggered ability is on the stack, you can't exile it from the zone it's put into.