If Combustible Courier hits, the next attack you boost this combat chain gains +3 . Boost (As an additional cost to play Combustible Courier, you may banish the top card of your deck. If it's a Mechanologist card, Combustible Courier gains go again.)

Set: History Pack Vol. 1
Finish: Regular
Type: Action
Subtype: Attack
Rarity: Common
Class: Mechanologist
Cost: 2
Defense: 3
Power: 4