Rocket Barrage

178.3. A Game Object that is more than one type can be affected by Game Effects that modify or interact with any of its types. Example: A unit that is also a gear can be affected by spells and abilities like the Ruination or Thermo Beam that say "Kill all units," or "Kill all gear." A unit that is also a gear can be targeted by spells and abilities like Vengeance or Rocket Barrage that say "Kill a unit," or "Kill a gear."

206. Effects that need to determine a card's cost for any purpose always use its printed or copied cost, even if that cost is increased, decreased, or ignored as the card is played. Example: Sky Splitter is a spell that costs [8] and says in part "This spell's Energy cost is reduced by the highest Might among units you control." Lux, Illuminated is a unit that says "When you play a spell that costs 5 or more, give me +3 [M] this turn." If a player who controls Lux plays Sky Splitter, Lux's ability will trigger, regardless of how much was actually paid for Sky Splitter. Example: Defy is a spell which reads "Counter a spell that costs no more than [4] and no more than [A]." Rocket Barrage is a spell that costs [4][C] and has a Repeat cost of [4][C]. Rocket Barrage is a legal target for Defy even if Rocket Barrage's Repeat cost is paid, because Defy only checks the printed or copied cost of its target. Example: Atakhan is a unit that reads in part "You may kill a friendly unit as an additional cost to play me. If you do, I cost [1] less for each Energy it costs and [Y] less for each Power it costs." If a player plays Atakhan and chooses to kill a Reflection token that is currently a copy of Noxus Hopeful, Atakhan will cost [4] less.

820.2.a. Choices made for the additional execution do not have to be the same as the choices made for the initial execution. Example: Rocket Barrage is a spell with [Repeat] [4][C] and "Choose one - Deal 4 to a unit in a base. [or] Kill a gear." If Rocket Barrage's controller pays its Repeat cost as they play it, they may choose the same mode or a different one, and if they choose the same mode, may choose the same target or a different one. If they choose "Kill a gear" twice and choose two different gear, they must specify which gear is the first target and which is the second. As the spell resolves, those two gear will be killed in the chosen order.