Cheapest priced copy (Ravnica Remastered): $6.49 at Card Kingdom, near mint, out of stock, their price list as of .
Rhythm of the Wild 
Enchantment · Uncommon · Ravnica Remastered · #380
Creature spells you control can't be countered.
Nontoken creatures you control have riot. (They enter with your choice of a +1/+1 counter or haste.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
7 printings · $6.49 to $17.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan Commander | 287 | Uncommon | $6.99 | — |
| Neon Dynasty Commander | 142 | Uncommon | $6.99 | — |
| Teenage Mutant Ninja Turtles Source Material | 12 | Mythic | $6.99 | $10.99 |
| Ravnica Allegiance | 201 | Uncommon | $6.99 | $11.99 |
| Ravnica Remastered | 217 | Uncommon | $7.49 | $6.99 |
| Ravnica Remastered | 380 | Uncommon | $6.49Out of stock | $8.99 |
| Secret Lair Drop | 1740 | Rare | $17.99 | $17.99 |
9 rulings from Wizards of the Coast
- 25 January 2019If a creature entering the battlefield has riot but can't have a +1/+1 counter put onto it, it gains haste.
- 25 January 2019Riot is a replacement effect. Players can't respond to your choice of +1/+1 counter or haste, and they can't take actions while the creature is on the battlefield without one or the other.
- 25 January 2019A noncreature card that happens to be entering the battlefield as a creature will have riot (for example, Rusted Relic while you control three other artifacts). Similarly, a creature card entering the battlefield as a noncreature permanent won't have riot (for example, Thassa, God of the Sea while your other permanents contribute only four to your devotion to blue).
- 25 January 2019Once a creature with riot has entered the battlefield, it keeps its +1/+1 counter or haste even if it loses riot.
- 25 January 2019A spell or ability that counters spells can still target a creature spell you control. When that spell or ability resolves, the creature spell won't be countered, but any additional effects of that spell or ability will still happen.
- 25 January 2019If a nontoken, noncreature permanent becomes a creature after it's already on the battlefield, it will have riot but it will be too late for the replacement effect to have any effect.
- 25 January 2019If you choose for the creature to gain haste, it gains haste indefinitely. It won't lose it as the turn ends or as another player gains control of it.
- 25 January 2019If a creature enters the battlefield with two instances of riot, you may choose to have it get two +1/+1 counters, one +1/+1 counter and haste, or two instances of haste. Multiple instances of haste on the same creature are redundant, but we're not going to tell the Gruul how to live their lives.
- 3 May 2019If Rhythm of the Wild leaves the battlefield at the same time that a nontoken creature enters the battlefield (most likely because that creature has a replacement effect, such as that of Rescuer Sphinx), that creature still gets a +1/+1 counter or haste.