Cheapest priced copy (Secret Lair Drop): $19.99 at Card Kingdom, near mint, their price list as of .
Sheoldred, Whispering One 
Legendary Creature — Phyrexian Praetor · 6/6 · Mythic · Iconic Masters · #108
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
At the beginning of your upkeep, return target creature card from your graveyard to the battlefield.
At the beginning of each opponent's upkeep, that player sacrifices a creature of their choice.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
11 printings · $19.99 to $119.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Iconic Masters | 108 | Mythic | $27.99 | $54.99 |
| Jumpstart | 278 | Mythic | $24.99 | — |
| Multiverse Legends | 16 | Mythic | $29.99 | $44.99 |
| Multiverse Legends | 81 | Mythic | — | — |
| Multiverse Legends | 146 | Mythic | — | $119.99 |
| Multiverse Legends | 146z | Mythic | — | — |
| New Phyrexia | 73 | Mythic | $27.99 | $59.99 |
| The List | JMP-278 | Mythic | — | — |
| The List | NPH-73 | Mythic | $24.99 | — |
| New Phyrexia Promos | 73★ | Mythic | — | $21.99 |
| Secret Lair Drop | 211 | Mythic | $19.99 | $20.99 |
4 rulings from Wizards of the Coast
- 17 November 2017The opponent whose upkeep it is chooses a creature to sacrifice when Sheoldred's second triggered ability resolves.
- 17 November 2017Swampwalk is a keyword ability that means “This creature can't be blocked if defending player controls a Swamp.” Most nonbasic lands don't have basic land types, even if they produce colored mana. For example, Graven Cairns is neither a Swamp nor a Mountain, while Blood Crypt is both.
- 17 November 2017If another triggered ability during your upkeep causes you to sacrifice a creature, such as that of Lord of the Pit, you won't be able to target it with Sheoldred's triggered ability as that ability is put on the stack.
- 17 November 2017In a Two-Headed Giant game, the last ability will trigger twice at the beginning of the opposing team's upkeep, once for each player on that team. Each player sacrifices only a creature they control.