Cheapest priced copy (Forgotten Realms Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Ride the Avalanche 
Instant · Rare · Forgotten Realms Commander · #54
The next spell you cast this turn can be cast as though it had flash. When you next cast a spell this turn, put X +1/+1 counters on up to one target creature, where X is the mana value of that spell.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $1.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Forgotten Realms Commander | 54 | Rare | $0.49 | — |
| Forgotten Realms Commander | 325 | Rare | $1.29 | — |
One ruling from Wizards of the Coast
- 23 July 2021Casting Ride the Avalanche doesn't require a target. As you put the delayed triggered ability on the stack after casting your next spell, you choose the target creature, if any.