Cheapest priced copy (Dominaria United Commander): $3.49 at Card Kingdom, near mint, their price list as of .
Gerrard's Hourglass Pendant 
Legendary Artifact · Rare · Dominaria United Commander · #17
Flash
If a player would begin an extra turn, that player skips that turn instead.
{4}, {T}, Exile Gerrard's Hourglass Pendant: Return to the battlefield tapped all artifact, creature, enchantment, and land cards in your graveyard that were put there from the battlefield this turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria United Commander | 17 | Rare | $3.49 | — |
| Dominaria United Commander | 93 | Rare | $3.49Out of stock | — |
5 rulings from Wizards of the Coast
- 9 September 2022Extra turns can still be created while Gerrard’s Hourglass Pendant is on the battlefield. They’re not skipped until they would begin, so if Gerrard’s Hourglass Pendant leaves the battlefield before that happens, the extra turns will be unaffected.
- 9 September 2022You choose what an Aura card put onto the battlefield this way will enchant. You can’t choose any permanent cards entering the battlefield at the same time as that Aura. If there’s nothing legal for the Aura to enchant, it stays in the graveyard.
- 9 September 2022An “extra turn” is any turn created by a spell or ability. Notably, it doesn’t include additional turns taken in tournaments after time expires for a round.
- 9 September 2022Permanent cards that were put into your graveyard from anywhere else, such as a card that was discarded, stay in the graveyard. Permanent cards that you gained control of and went to another player’s graveyard from the battlefield will likewise stay in the graveyard.
- 9 September 2022Permanent spells that were countered earlier in the turn never entered the battlefield, so they won’t return to the battlefield because of the last ability.