Contested Game Ball — ruling 1

Contested Game Ball's triggered ability triggers only once whenever you're dealt combat damage, no matter how many creatures deal combat damage to you at the same time.

Contested Game Ball — ruling 2

If point counters are put on Contested Game Ball some way other than its last ability, you won't sacrifice it or create a Treasure token. The check for five or more point counters happens only as the activated ability resolves.

Contested Game Ball — ruling 3

In a Two-Headed Giant game, each player on the attacking team is an attacking player. When Contested Game Ball's first ability resolves, you'll choose which member of the attacking team gains control of it.

Contested Game Ball : règles, fonctionnement et interactions (MTG)

Contested Game Ball 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

Whenever you're dealt combat damage, the attacking player gains control of this artifact and untaps it. , : Draw a card and put a point counter on this artifact. Then if it has five or more point counters on it, sacrifice it and create a Treasure token.

How it works : Contested Game Ball

Original English text — Wizards of the Coast / Scryfall

#1November 10, 2023· Wizards of the Coast
Contested Game Ball's triggered ability triggers only once whenever you're dealt combat damage, no matter how many creatures deal combat damage to you at the same time.
No other card is named in this ruling.
#2November 10, 2023· Wizards of the Coast
If point counters are put on Contested Game Ball some way other than its last ability, you won't sacrifice it or create a Treasure token. The check for five or more point counters happens only as the activated ability resolves.
Card named in this ruling
Treasure
#3November 10, 2023· Wizards of the Coast
In a Two-Headed Giant game, each player on the attacking team is an attacking player. When Contested Game Ball's first ability resolves, you'll choose which member of the attacking team gains control of it.
No other card is named in this ruling.