Cheapest priced copy (Ravnica Allegiance): $0.35 at Card Kingdom, near mint, their price list as of .
Undercity Scavenger 
Creature — Ogre Warrior · 3/3 · Common · Ravnica Allegiance · #88
When this creature enters, you may sacrifice another creature. If you do, put two +1/+1 counters on this creature, then scry 2.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica Allegiance | 88 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 25 January 2019You choose whether to sacrifice a creature (and which one to sacrifice) while Undercity Scavenger’s ability is resolving. No player may take actions between the time you choose which creature to sacrifice, the time Undercity Scavenger has +1/+1 counters on it, and the time you scry 2.
- 25 January 2019You can’t sacrifice multiple creatures to put more +1/+1 counters on Undercity Scavenger or to scry more.