Cheapest priced copy (Commander 2015): $0.49 at Card Kingdom, near mint, their price list as of .
Kalemne's Captain 
Creature — Giant Soldier · 5/5 · Rare · Commander 2020 · #92
Vigilance
{5}{W}{W}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
When this creature becomes monstrous, exile all artifacts and enchantments.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2015 | 5 | Rare | $0.49 | — |
| Commander 2020 | 92 | Rare | $0.49 | — |
| Commander Anthology Volume II | 31 | Rare | $0.49 | — |
3 rulings from Wizards of the Coast
- 4 November 2015Monstrous isn’t an ability that the creature has. It’s just something true about that creature. If the creature stops being a creature or loses its abilities, it continues to be monstrous.
- 4 November 2015Once a creature becomes monstrous, it can’t become monstrous again. If Kalemne’s Captain is already monstrous, the activated ability won’t do anything.
- 4 November 2015An ability that triggers when a creature becomes monstrous won’t trigger if that creature isn’t on the battlefield when its monstrosity ability resolves.