Cheapest priced copy (The Brothers' War): $0.35 at Card Kingdom, near mint, their price list as of .
Citanul Stalwart 
Creature — Elf Druid Soldier · 1/1 · Common · The Brothers' War · #175
{T}, Tap an untapped artifact or creature you control: Add one mana of any color.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War | 175 | Common | $0.35 | $0.79 |
One ruling from Wizards of the Coast
- 14 October 2022You can tap any untapped artifact or creature you control, including a creature you haven't controlled continuously since the beginning of your most recent turn, to pay the cost of Citanul Stalwart's activated ability. However, you must have controlled Citanul Stalwart continuously since the beginning of your most recent turn.