Cheapest priced copy (Forgotten Realms Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Fleecemane Lion 
Creature — Cat · 3/3 · Rare · Theros · #193
{3}{G}{W}: Monstrosity 1. (If this creature isn't monstrous, put a +1/+1 counter on it and it becomes monstrous.)
As long as this creature is monstrous, it has hexproof and indestructible.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Forgotten Realms Commander | 185 | Rare | $0.49 | — |
| Commander 2017 | 172 | Rare | $0.69 | — |
| Marvel Super Heroes Commander (Wakandan War Panther) | 282 | Rare | $0.49 | $0.49 |
| Marvel Super Heroes Commander (Wakandan War Panther) | 423 | Rare | $0.79 | — |
| Theros | 193 | Rare | $0.69 | $1.49 |
3 rulings from Wizards of the Coast
- 15 September 2013Monstrous isn't an ability that a creature has. It's just something true about that creature. If the creature stops being a creature or loses its abilities, it will continue to be monstrous.
- 15 September 2013An ability that triggers when a creature becomes monstrous won't trigger if that creature isn't on the battlefield when its monstrosity ability resolves.
- 15 September 2013Once a creature becomes monstrous, it can't become monstrous again. If the creature is already monstrous when the monstrosity ability resolves, nothing happens.