Cheapest priced copy (Dominaria Remastered): $0.49 at Card Kingdom, near mint, their price list as of .
Vexing Sphinx 
Creature — Sphinx · 4/4 · Rare · Dominaria Remastered · #297
Flying
Cumulative upkeep—Discard a card. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
When this creature dies, draw a card for each age counter on it.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.49 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Coldsnap | 50 | Rare | $1.29 | $5.99Out of stock |
| Dominaria Remastered | 73 | Rare | $0.59 | $0.49 |
| Dominaria Remastered | 297 | Rare | $0.49 | $0.49 |
2 rulings from Wizards of the Coast
- 1 October 2008Paying cumulative upkeep is always optional. If it's not paid, the permanent with cumulative upkeep is sacrificed. Partial payments of the total cumulative upkeep cost can't be made. For example, if a permanent with “cumulative upkeep {1}” has three age counters on it when its cumulative upkeep ability triggers, it gets another age counter and then its controller chooses to either pay {4} or sacrifice the permanent.
- 8 December 2022Paying cumulative upkeep is always optional. If it’s not paid, the permanent with cumulative upkeep is sacrificed. Partial payments of the total cumulative upkeep cost can’t be made. For example, if Vexing Sphinx has three age counters on it when its cumulative upkeep ability triggers, it gets another age counter and then its controller chooses to either discard four cards or sacrifice it.