Cheapest priced copy (Guilds of Ravnica): $0.35 at Card Kingdom, near mint, their price list as of .
Sonic Assault 
Instant · Common · Guilds of Ravnica · #199
Tap target creature. Sonic Assault deals 2 damage to that creature's controller.
Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guilds of Ravnica | 199 | Common | $0.35 | $0.49 |
6 rulings from Wizards of the Coast
- 5 October 2018If the target creature becomes an illegal target for Sonic Assault, the spell doesn't resolve. No player is dealt damage.
- 5 October 2018You must still follow any timing restrictions and permissions when casting a spell with jump-start, including those based on the card's type. For instance, you can cast a sorcery using jump-start only when you could normally cast a sorcery.
- 5 October 2018Sonic Assault can target a tapped creature. The creature can't be tapped again, but Sonic Assault still deals 2 damage to that creature's controller.
- 5 October 2018If a card with jump-start is put into your graveyard during your turn, you'll be able to cast it right away if it's legal to do so, before an opponent can take any actions.
- 5 October 2018A spell cast using jump-start will always be exiled afterward, whether it resolves, it's countered, or it leaves the stack in some other way.
- 5 October 2018If an effect allows you to pay an alternative cost rather than a spell's mana cost, you may pay that alternative cost when you jump-start a spell. You'll still discard a card as an additional cost to cast it.