Cheapest priced copy (Dominaria): $0.35 at Card Kingdom, near mint, their price list as of .
Goblin Barrage 
Sorcery · Uncommon · Dominaria · #128
Kicker—Sacrifice an artifact or Goblin. (You may sacrifice an artifact or Goblin in addition to any other costs as you cast this spell.)
Goblin Barrage deals 4 damage to target creature. If this spell was kicked, it also deals 4 damage to target player or planeswalker.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria | 128 | Uncommon | $0.35 | $0.49 |
7 rulings from Wizards of the Coast
- 27 April 2018You can't cast Goblin Barrage unless you choose a creature as a target, even if it's kicked. However, you can target a Goblin or artifact creature you control and then sacrifice it to pay the kicker cost. The target player or planeswalker will be dealt 4 damage.
- 8 November 2024The kicker ability doesn't let you pay a kicker cost more than once.
- 8 November 2024If you put a permanent with a kicker ability onto the battlefield without casting it, you can't kick it.
- 8 November 2024If a spell's kicker cost was paid, the spell is "kicked."
- 8 November 2024To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions. The spell's mana value remains unchanged, no matter what the total cost to cast it was.
- 8 November 2024If a card or token enters as a copy of a permanent, the new permanent isn't kicked, even if the original was.
- 8 November 2024If you copy a kicked spell on the stack, the copy is also kicked. If the copied spell is a permanent spell, the token the copy of that spell becomes when it enters is also kicked.