Cheapest priced copy (Commander 2020): $79.99 at Card Kingdom, near mint, their price list as of .
Fierce Guardianship 
Instant · Rare · Commander Masters · #94
If you control a commander, you may cast this spell without paying its mana cost.
Counter target noncreature spell.
Legal inCommanderLegacyVintage
Banned inBrawl
Not legal inStandardPioneerModernPauper
7 printings · $79.99 to $149.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 35 | Rare | $79.99 | — |
| Commander Masters | 94 | Rare | $79.99 | $109.99 |
| Commander Masters | 489 | Rare | — | — |
| Commander Masters | 694 | Rare | $94.99 | $149.99 |
| Secret Lair Countdown | 55 | Rare | — | — |
| Secret Lair Drop | 1823 | Rare | $84.99 | $94.99Out of stock |
| Avatar: The Last Airbender Eternal | 307 | Rare | $99.99 | — |
2 rulings from Wizards of the Coast
- 17 April 2020Once you begin casting this spell, players can't take any other actions until you're done casting it. Notably, they can't try to remove the commander you control to make you pay its cost.
- 17 April 2020It doesn't matter whose commander you control. Any one will do. If you have two commanders, you just need to control one of them.