FOILCheapest priced copy (Dominaria United): $1.29 at Card Kingdom, near mint, their price list as of .
Rivaz of the Claw 
Legendary Creature — Lizard Warlock · 3/3 · Rare · Dominaria United Promos · #215s
Menace
{T}: Add two mana in any combination of colors. Spend this mana only to cast Dragon creature spells.
Once during each of your turns, you may cast a Dragon creature spell from your graveyard.
Whenever you cast a Dragon creature spell from your graveyard, it gains "When this creature dies, exile it."
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $1.29 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria United | 215 | Rare | $1.99 | $2.49 |
| Dominaria United | 314 | Rare | $1.29 | $2.49 |
| Dominaria United | 355 | Rare | — | $2.79 |
| Dominaria United Promos | 215p | Rare | $1.79 | $3.49 |
| Dominaria United Promos | 215s | Rare | — | $6.99 |
6 rulings from Wizards of the Coast
- 9 September 2022The casting permission granted by Rivaz’s third ability doesn’t change when you may cast the spell from your graveyard.
- 9 September 2022The ability that the spell gains as Rivaz’s last ability resolves continues to apply to the permanent that spell becomes after the spell resolves, even if it stops being a Dragon or stops being a creature.
- 9 September 2022The ability that the spell gains only applies to it once it’s on the battlefield. If the spell is countered before it resolves, that ability will not exile it.
- 9 September 2022The last ability triggers when you cast a Dragon creature spell from your graveyard for any reason. It triggers even if you didn’t use mana generated by Rivaz’s activated ability to pay its costs.
- 9 September 2022Once you begin casting a spell from your graveyard, it immediately moves to the stack. Players can’t take any other actions until you’re done casting the spell.
- 9 September 2022You can use mana generated by the activated ability to pay an alternative cost (such as an escape cost) or an additional cost to cast a Dragon spell. It’s not limited to paying just that spell’s mana cost.