Cheapest priced copy (Dominaria United Commander): $0.79 at Card Kingdom, near mint, their price list as of .
Neheb, Dreadhorde Champion 
Legendary Creature — Zombie Minotaur Warrior · 5/4 · Rare · War of the Spark · #140
Trample
Whenever Neheb deals combat damage to a player or planeswalker, you may discard any number of cards. If you do, draw that many cards and add that much {R}. Until end of turn, you don't lose this mana as steps and phases end.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.79 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria United Commander | 125 | Rare | $0.79 | — |
| War of the Spark Promos | 140★ | Rare | — | $1.79 |
| War of the Spark Promos | 140s | Rare | — | $3.49 |
| Secret Lair Drop | 857 | Rare | — | $2.49 |
| War of the Spark | 140 | Rare | $0.99 | $2.49 |
One ruling from Wizards of the Coast
- 3 May 2019Other effects may cause you to draw more or fewer cards than the number of cards you discarded. In these cases, the amount of mana you add is equal to the number of cards you discarded, not the number of cards you drew.