Cheapest priced copy (Foundations Jumpstart): $0.99 at Card Kingdom, near mint, their price list as of .
Necropolis Regent 
Creature — Vampire · 6/5 · Mythic · Commander 2021 · #147
Flying
Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.99 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2021 | 147 | Mythic | $1.49 | — |
| Explorers of Ixalan | 20 | Mythic | $1.49 | — |
| Foundations Jumpstart | 469 | Mythic | $0.99 | — |
| Return to Ravnica | 71 | Mythic | $1.29 | $12.99 |
| Crimson Vow Commander | 132 | Mythic | $1.29 | — |
One ruling from Wizards of the Coast
- 1 October 2012If that creature deals combat damage to a player at the same time it's dealt lethal damage (perhaps because it has trample and was blocked), it will die before the triggered ability resolves and puts +1/+1 counters on it.