Cheapest priced copy (Guilds of Ravnica): $0.49 at Card Kingdom, near mint, their price list as of .
Charnel Troll 
Creature — Troll · 4/4 · Rare · Guilds of Ravnica · #160
Trample
At the beginning of your upkeep, exile a creature card from your graveyard. If you do, put a +1/+1 counter on this creature. Otherwise, sacrifice it.
{B}{G}, Discard a creature card: Put a +1/+1 counter on this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guilds of Ravnica | 160 | Rare | $0.49 | $0.49 |
3 rulings from Wizards of the Coast
- 5 October 2018You can activate Charnel Troll’s last ability during your upkeep before its triggered ability resolves.
- 5 October 2018Because your upkeep step is after your untap step, your lands will be untapped to help you activate Charnel Troll’s last ability during your upkeep. However, because your upkeep step is before your draw step, you won’t have drawn a card for the turn yet.
- 5 October 2018You can’t choose not to exile a creature card from your graveyard if you have one to exile.