Cheapest priced copy (Khans of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Mardu Warshrieker 
Creature — Orc Shaman · 3/3 · Common · Khans of Tarkir · #117
Raid — When this creature enters, if you attacked this turn, add {R}{W}{B}.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 117 | Common | $0.35 | $0.49 |
| The List | KTK-117 | Common | $0.35 | — |
3 rulings from Wizards of the Coast
- 20 September 2014Mardu Warshrieker's raid ability isn't a mana ability even though it adds mana. It uses the stack and can be responded to.
- 8 November 2024Raid abilities care only that you attacked with a creature. It doesn't matter how many creatures you attacked with or which player, planeswalker, or battle those creatures attacked.
- 8 November 2024Raid abilities evaluate the entire turn to see if you attacked with a creature. That creature doesn't have to still be on the battlefield. Similarly, the player, planeswalker, or battle it attacked doesn't have to still be in the game or on the battlefield.