How does "The Arena's Greatest" card work - does it trigger every round or just once, and does it affect all players or just the holder?

Ruling: The card triggers only once at the start of each player's first Beginning Phase of the game, reducing the victory point requirement from 8 to 7 for all players.

Sequence:

• Declare the triggered ability at the start of the game before channeling runes
• At the start of each player's first Beginning Phase, the effect applies
• Each player only needs to score 7 points instead of 8 to win

Nuances:

• This is a triggered ability that must be declared before channeling runes
• The effect applies to all players, not just the card holder
• Despite saying "each player's Beginning Phase," it only happens once per player (their first Beginning Phase)