Cheapest priced copy (Outlaws of Thunder Junction Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Witch of the Moors 
Creature — Human Warlock · 4/4 · Rare · Secrets of Strixhaven Commander · #230
Deathtouch
At the beginning of your end step, if you gained life this turn, each opponent sacrifices a creature of their choice and you return up to one target creature card from your graveyard to your hand.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
5 printings · $0.99 to $15.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart | 18 | Rare | $1.29 | — |
| Outlaws of Thunder Junction Commander | 152 | Rare | $0.99 | — |
| The List | JMP-18 | Rare | $1.29 | — |
| Secret Lair Drop | 1722 | Rare | $11.99 | $15.99 |
| Secrets of Strixhaven Commander | 230 | Rare | $0.99Out of stock | — |
5 rulings from Wizards of the Coast
- 23 June 2020The triggered ability looks at whether you've gained life in the turn, even if Witch of the Moors wasn't on the battlefield when you gained life. It doesn't care if you also lost life, even if you lost more life than you gained.
- 23 June 2020You don't have to choose a target creature card at all. If you do and the target card is an illegal target by the time the ability tries to resolve, the ability won't resolve. Your opponents won't sacrifice creatures.
- 23 June 2020As the triggered ability resolves, first the next opponent in turn order chooses a creature they control, then each other opponent in turn order does the same knowing the choices made before them. Then all the chosen creatures are sacrificed at the same time.
- 23 June 2020If you haven't gained life by the time your end step begins, the triggered ability won't trigger at all.
- 23 June 2020The triggered ability triggers just once, no matter how much life you've gained.