Cheapest priced copy (Amonkhet): $0.35 at Card Kingdom, near mint, their price list as of .
Defiant Greatmaw 
Creature — Hippo · 4/5 · Uncommon · Amonkhet · #163
When this creature enters, put two -1/-1 counters on target creature you control.
Whenever you put one or more -1/-1 counters on this creature, remove a -1/-1 counter from another target creature you control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Amonkhet | 163 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 18 April 2017If a creature with wither or infect deals damage to a creature, the controller of the creature with wither or infect puts that many -1/-1 counters on the second creature.
- 18 April 2017If you put enough -1/-1 counters on Defiant Greatmaw so that its toughness is 0 or less, its last ability triggers.