Cheapest priced copy (War of the Spark): $1.29 at Card Kingdom, near mint, their price list as of .
The Elderspell 
Sorcery · Rare · War of the Spark · #89
Destroy any number of target planeswalkers. Choose a planeswalker you control. Put two loyalty counters on it for each planeswalker destroyed this way.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $1.29 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| War of the Spark Promos | 89p | Rare | $1.79 | $3.49Out of stock |
| War of the Spark Promos | 89s | Rare | — | $2.99 |
| War of the Spark | 89 | Rare | $1.29 | $1.99 |
2 rulings from Wizards of the Coast
- 3 May 2019You can cast The Elderspell without controlling any planeswalkers. The target planeswalkers will still be destroyed. You can also cast it without targeting any planeswalkers if you really want to do so.
- 3 May 2019You choose the target planeswalkers to destroy as you cast The Elderspell, but you don’t choose a planeswalker to receive loyalty counters until The Elderspell is resolving.