Great Train Heist

Spree (Choose one or more additional costs.)
+ 2R — 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.