Rocket Launcher — ruling 1

You can choose different targets for each use.

Rocket Launcher — ruling 2

Because it does not have tapping as part of its activation cost, you can activate the ability many times in one turn, but it is destroyed at the end of any turn in which you use it.

Rocket Launcher — ruling 3

It is only destroyed at end of turn if the ability resolved. If the ability is countered, it is not sacrificed.

Rocket Launcher : règles, fonctionnement et interactions (MTG)

Rocket Launcher is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

: This artifact deals 1 damage to any target. Destroy this artifact at the beginning of the next end step. Activate only if you've controlled this artifact continuously since the beginning of your most recent turn.

How it works : Rocket Launcher

Original English text — Wizards of the Coast / Scryfall

#1October 4, 2004· Wizards of the Coast
You can choose different targets for each use.
No other card is named in this ruling.
#2October 4, 2004· Wizards of the Coast
Because it does not have tapping as part of its activation cost, you can activate the ability many times in one turn, but it is destroyed at the end of any turn in which you use it.
No other card is named in this ruling.
#3October 4, 2004· Wizards of the Coast
It is only destroyed at end of turn if the ability resolved. If the ability is countered, it is not sacrificed.
No other card is named in this ruling.