Cheapest priced copy (The Brothers' War): $23.99 at Card Kingdom, near mint, their price list as of .
Myrel, Shield of Argive 
Legendary Creature — Human Soldier · 3/4 · Mythic · The Brothers' War · #305
During your turn, your opponents can't cast spells or activate abilities of artifacts, creatures, or enchantments.
Whenever Myrel attacks, create X 1/1 colorless Soldier artifact creature tokens, where X is the number of Soldiers you control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $23.99 to $109.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War | 18 | Mythic | $23.99 | $27.99 |
| The Brothers' War | 305 | Mythic | $27.99 | $32.99 |
| The Brothers' War Promos | 18p | Mythic | $27.99 | $29.99 |
| The Brothers' War Promos | 18s | Mythic | — | $34.99 |
| Secret Lair Countdown | 13 | Rare | $24.99 | $32.99 |
| Secret Lair Countdown | 40 | Rare | — | $109.99 |
2 rulings from Wizards of the Coast
- 14 October 2022Myrel, Shield of Argive's first ability prevents opponents from activating abilities of permanents on the battlefield that are artifacts, creatures, and/or enchantments. It doesn't prevent activated abilities from cards in any zone other than the battlefield. Notably, this means that your opponents may still activate abilities of cards in their graveyard (such as unearth).
- 14 October 2022Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keyword abilities (such as equip and unearth) are activated abilities and will have colons in their reminder text.