Cheapest priced copy (Modern Horizons 3): $0.35 at Card Kingdom, near mint, their price list as of .
Etched Slith 
Artifact Creature — Phyrexian Slith · 1/1 · Uncommon · Modern Horizons 3 · #91
Menace
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it. When you do, you may remove a counter from another target permanent or opponent.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 | 91 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 7 June 2024You don't choose a target for Etched Slith's last ability at the time it triggers. Rather, a second "reflexive" ability triggers when you put a +1/+1 counter on Etched Slith this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.
- 7 June 2024If there's more than one type of counter on the targeted permanent or opponent, Etched Slith's controller chooses which counter to remove.
- 7 June 2024In a case where you put more than one +1/+1 counter on Etched Slith with its last ability (for example, because of the effect of Doubling Season), the reflexive ability will trigger once for each +1/+1 counter you put on it this way.