Cheapest priced copy (Final Fantasy Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Thancred Waters 
Legendary Creature — Human Warrior · 3/5 · Rare · Final Fantasy Commander · #139
Flash
Royal Guard — When Thancred Waters enters, another target legendary permanent you control gains indestructible for as long as you control Thancred Waters.
Whenever you cast a noncreature spell, Thancred Waters gains indestructible until end of turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Final Fantasy Commander | 31 | Rare | $0.49 | $0.49 |
| Final Fantasy Commander | 139 | Rare | $0.59 | $4.49 |
2 rulings from Wizards of the Coast
- 6 June 2025Thancred Waters's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.
- 6 June 2025If Thancred Waters leaves the battlefield or you lose control of it before its triggered ability resolves, the target legendary permanent won't gain indestructible at all.