Cheapest priced copy (Ikoria: Lair of Behemoths): $3.99 at Card Kingdom, near mint, their price list as of .
Chevill, Bane of Monsters 
Legendary Creature — Human Rogue · 1/3 · Mythic · Ikoria: Lair of Behemoths · #330
Deathtouch
At the beginning of your upkeep, if your opponents control no permanents with bounty counters on them, put a bounty counter on target creature or planeswalker an opponent controls.
Whenever a permanent an opponent controls with a bounty counter on it dies, you gain 3 life and draw a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $3.99 to $14.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 181 | Mythic | $3.99 | $4.99 |
| Ikoria: Lair of Behemoths | 330 | Mythic | $5.99 | $14.99 |
| Ikoria: Lair of Behemoths Promos | 181p | Mythic | $10.99 | $10.99 |
| Ikoria: Lair of Behemoths Promos | 181s | Mythic | — | $7.49 |
4 rulings from Wizards of the Coast
- 17 April 2020If the creature or planeswalker with a bounty counter on it ceases to be a creature or planeswalker, Chevill’s last ability will still trigger if that permanent is put into a graveyard from the battlefield.
- 17 April 2020Chevill’s middle ability and last ability look for any bounty counter on your opponents’ permanents, not just one from that Chevill. For example, if players A and B each control a Chevill and player A has put a bounty counter on player C’s creature, player B’s Chevill won’t put a counter on anything and both players will gain 3 life and draw a card when that creature dies.
- 17 April 2020If your life total is brought to 0 or less at the same time that a creature with a bounty counter on it is dealt lethal damage, you lose the game before the last ability goes on the stack.
- 17 April 2020If Chevill leaves the battlefield at the same time that an opponent’s permanent with a bounty counter on it dies, you gain 3 life and draw a card. If Chevill leaves the battlefield before that permanent dies, Chevill’s last ability won’t be around to trigger.