Cheapest priced copy (Tarkir: Dragonstorm Promos): $3.49 at Card Kingdom, near mint, their price list as of .
Frostcliff Siege 
Enchantment · Rare · Tarkir: Dragonstorm · #187
As this enchantment enters, choose Jeskai or Temur.
• Jeskai — Whenever one or more creatures you control deal combat damage to a player, draw a card.
• Temur — Creatures you control get +1/+0 and have trample and haste.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $3.49 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Promos | 187p | Rare | $3.49 | $3.49 |
| Tarkir: Dragonstorm Promos | 187s | Rare | — | $4.99 |
| Tarkir: Dragonstorm | 187 | Rare | $3.49 | $3.49 |
| Tarkir: Dragonstorm | 385 | Rare | $4.49 | $6.99 |
2 rulings from Wizards of the Coast
- 4 April 2025If you somehow control Frostcliff Siege and no choice was made for it (perhaps because another permanent on the battlefield became a copy of it), it has neither of the two abilities.
- 4 April 2025If you chose Jeskai and creatures you control deal combat damage to multiple players at the same time, Frostcliff Siege’s ability will trigger once for each player dealt combat damage this way.