Great Train Heist is a rare Instant card from Outlaws of Thunder Junction Promos (POTJ), collector number 125p. Current market price: $4.81 (foil $4.93), TCGplayer market prices via Scryfall.
Spree (Choose one or more additional costs.) + {2}{R} — Untap all creatures you control. If it's your combat phase, there is an additional combat phase after this phase. + {2} — Creatures you control get +1/+0 and gain first strike until end of turn. + {R} — Choose target opponent. Whenever a creature you control deals combat damage to that player this turn, create a tapped Treasure token.