Cheapest priced copy (Conspiracy): $0.35 at Card Kingdom, near mint, their price list as of .
Marchesa's Emissary 
Creature — Human Rogue · 2/2 · Common · Conspiracy · #21
Hexproof (This creature can't be the target of spells or abilities your opponents control.)
Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conspiracy | 21 | Common | $0.35 | $0.49 |
4 rulings from Wizards of the Coast
- 29 May 2014Once dethrone triggers, it doesn't matter what happens to the players' life totals before the ability resolves. You'll put a +1/+1 counter on the creature even if the defending player doesn't have the most life as the ability resolves.
- 29 May 2014In a Two-Headed Giant game, dethrone will trigger if the creature attacks either player on the team with the most life or tied for the most life.
- 29 May 2014The +1/+1 counter is put on the creature before blockers are declared.
- 28 July 2023Dethrone doesn't trigger if the creature attacks a planeswalker, even if its controller has the most life. The same is true if the creature attacks a battle, even if its protector has the most life.