Oath of Scholars — ruling 1

The ability can only target an opponent of the current player.

Oath of Scholars — ruling 2

The targeted player having more cards in their hand than the current player is a part of the targeting requirement. A player can’t be targeted by this ability unless it’s true, and the ability doesn’t resolve if it’s no longer true at that time.

Oath of Scholars : règles, fonctionnement et interactions (MTG)

Oath of Scholars 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

At the beginning of each player's upkeep, that player chooses target player who has more cards in hand than they do and is their opponent. The first player may discard their hand and draw three cards.

How it works : Oath of Scholars

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2009· Wizards of the Coast
The ability can only target an opponent of the current player.
No other card is named in this ruling.
#2October 1, 2009· Wizards of the Coast
The targeted player having more cards in their hand than the current player is a part of the targeting requirement. A player can’t be targeted by this ability unless it’s true, and the ability doesn’t resolve if it’s no longer true at that time.
No other card is named in this ruling.