Cheapest priced copy (The Brothers' War): $0.99 at Card Kingdom, near mint, their price list as of .
Bladecoil Serpent 
Artifact Creature — Serpent · 5/4 · Mythic · The Brothers' War Promos · #229p
When this creature enters, for each {U}{U} spent to cast it, draw a card.
When this creature enters, for each {B}{B} spent to cast it, each opponent discards a card.
When this creature enters, for each {R}{R} spent to cast it, it gets +1/+0 and gains trample and haste until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.99 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War | 229 | Mythic | $0.99 | $0.99 |
| The Brothers' War | 361 | Mythic | $0.99 | $0.99 |
| The Brothers' War Promos | 229p | Mythic | $0.99 | $2.49 |
| The Brothers' War Promos | 229s | Mythic | — | $0.99 |