Goblin Bangchuckers — ruling 1

You choose the target when you activate the ability. You don’t flip the coin until the ability resolves. Players may respond to the ability, but they won’t know the results of the coin flip.

Goblin Bangchuckers — ruling 2

If the permanent or player is an illegal target when Goblin Bangchuckers’ ability tries to resolve, it won’t resolve and none of its effects will happen. You won’t flip a coin and no damage will be dealt.

Goblin Bangchuckers : règles, fonctionnement et interactions (MTG)

Goblin Bangchuckers 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

: Flip a coin. If you win the flip, this creature deals 2 damage to any target. If you lose the flip, this creature deals 2 damage to itself.

How it works : Goblin Bangchuckers

Original English text — Wizards of the Coast / Scryfall

#1September 22, 2011· Wizards of the Coast
You choose the target when you activate the ability. You don’t flip the coin until the ability resolves. Players may respond to the ability, but they won’t know the results of the coin flip.
No other card is named in this ruling.
#2September 22, 2011· Wizards of the Coast
If the permanent or player is an illegal target when Goblin Bangchuckers’ ability tries to resolve, it won’t resolve and none of its effects will happen. You won’t flip a coin and no damage will be dealt.
No other card is named in this ruling.