Cheapest priced copy (Commander Legends): $2.49 at Card Kingdom, near mint, their price list as of .
Szat's Will 
Instant · Rare · Commander Legends · #655
Choose one. If you control a commander as you cast this spell, you may choose both instead.
• Each opponent sacrifices a creature they control with the greatest power.
• Exile all opponents' graveyards, then create X 0/1 black Thrull creature tokens, where X is the greatest power among creature cards exiled this way.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $2.49 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 152 | Rare | $2.49 | $3.49 |
| Commander Legends | 655 | Rare | $4.49 | $7.99 |
10 rulings from Wizards of the Coast
- 10 November 2020For the second mode, use the powers of the creature cards as they existed in the graveyard to determine the value of X.
- 10 November 2020Once you've chosen both modes for the spell, it doesn't matter whether you continue to control a commander. This is true even if you somehow no longer control a commander as you finish casting the spell.
- 10 November 2020If an opponent controls more than one creature with the greatest power among creatures they control, they choose which one to sacrifice.
- 10 November 2020Each opponent considers their creatures independently. For example, if one opponent controls creatures with powers 4 and 5, and another opponent controls creatures with powers 2 and 7, the creatures with powers 5 and 7 will be sacrificed.
- 10 November 2020There's no extra bonus if you control more than one commander.
- 10 November 2020Once you've announced that you're casting a spell, players can't take any actions until you've finished doing so. Notably, opponents can't try to remove your commander to change how many modes you may choose.
- 10 November 2020The commander you control doesn't have to be your commander.
- 10 November 2020Even though the card is named after a specific character, controlling any commander will satisfy its condition.
- 10 November 2020If both modes are chosen, and an opponent sacrifices a creature token to the first mode, that token will be in the graveyard as the instructions in the second mode are followed. As it's not a creature card, it won't be exiled, and it won't be considered for determining the value of X. The token will cease to exist after Szat's Will resolves.
- 10 November 2020If both modes are chosen, they happen in the stated order. Any creature cards that end up in an opponent's graveyard because they were sacrificed for the first mode will be exiled as the instructions for the second mode are followed.