Cheapest priced copy (Modern Horizons): $0.35 at Card Kingdom, near mint, their price list as of .
Goblin War Party 
Sorcery · Common · The List · #MH1-131
Choose one —
• Create three 1/1 red Goblin creature tokens.
• Creatures you control get +1/+1 and gain haste until end of turn.
Entwine {2}{R} (Choose both if you pay the entwine cost.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons | 131 | Common | $0.35 | $3.99 |
| The List | MH1-131 | Common | — | — |
2 rulings from Wizards of the Coast
- 14 June 2019Goblin War Party’s second mode affects only creatures you control at the time the spell resolves. Creatures you begin to control later in the turn won’t get +1/+1 or gain haste.
- 14 June 2019If Goblin War Party is entwined, its modes are performed in order. The Goblin tokens you create get +1/+1 and gain haste.