Arbiter of Knollridge

Mana cost: {6}{W}
Type: Creature — Giant Wizard
Power / toughness: 5 / 5
Set: Commander 2011 #6 (rare)
Price: $0.31 USD

Vigilance
When this creature enters, each player's life total becomes the highest life total among all players.

Arbiter of Knollridge has 4 printings, first in Lorwyn (2007). EDHREC ranks it #14,046 among Commander cards. It appears most in Gluntch, the Bestower decks (1,570 on EDHREC). 3 public decks on TCG run it. It has 3 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Arbiter of Knollridge

Political Puppets - Commander 2011, led by Zedruu the Greathearted
Wade into Battle - Commander 2015, led by Kalemne, Disciple of Iroas
Wade into Battle - Commander Anthology Volume II, led by Kalemne, Disciple of Iroas

Commanders that run Arbiter of Knollridge most

Deck counts from EDHREC.

Often played with Arbiter of Knollridge

Cards that show up in the same decks on EDHREC.

Rulings

2007-10-01: In other multiplayer formats, each player's life total is set to the highest life total within their range of influence. These changes happen at the same time. For example, if each player has a range of influence of one, and the players in the game are Alice (4 life), Barry (8 life), Carrie (11 life), and Doug (7 life), in that order, then Alice's life total will become 8 and Barry and Doug's life totals will each become 11.
2007-10-01: Abilities that trigger when a player gains life may trigger as a result of this ability.
2010-06-15: In a Two-Headed Giant game, each team chooses one person on that team to gain the appropriate amount of life. This basically means that the triggered ability will set the life total of each team to that of the team with the highest life total.