Cheapest priced copy (Edge of Eternities): $0.49 at Card Kingdom, near mint, their price list as of .
Terminal Velocity 
Sorcery · Rare · Edge of Eternities · #338
You may put an artifact or creature card from your hand onto the battlefield. That permanent gains haste, "When this permanent leaves the battlefield, it deals damage equal to its mana value to each creature," and "At the beginning of your end step, sacrifice this permanent."
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Edge of Eternities | 163 | Rare | $0.49 | $0.49 |
| Edge of Eternities | 338 | Rare | $0.49 | $0.49 |
| Edge of Eternities Promos | 163p | Rare | $0.49 | $0.49 |
| Edge of Eternities Promos | 163s | Rare | — | $0.49 |
2 rulings from Wizards of the Coast
- 25 July 2025If a permanent has {X} in its mana cost, X is 0 for the purpose of determining its mana value.
- 25 July 2025Use the permanent’s mana value as it last existed on the battlefield to determine how much damage the triggered ability deals.