Leadership Vacuum — ruling 1

Leadership Vacuum targets the player, not their creatures. A commander with hexproof or protection from blue may be returned this way.

Leadership Vacuum — ruling 2

You'll draw a card even if the target player controls no commanders as Leadership Vacuum resolves.

Leadership Vacuum — ruling 3

The "commander tax" increases based on how many times a commander was cast from the command zone, not how many times it was put there as a result of Commander rules. The returned commander will cost more to cast again even though it was put directly into the command zone.

Leadership Vacuum : règles, fonctionnement et interactions (MTG)

Leadership Vacuum 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

Target player returns each commander they control from the battlefield to the command zone. Draw a card.

How it works : Leadership Vacuum

Original English text — Wizards of the Coast / Scryfall

#1August 23, 2019· Wizards of the Coast
Leadership Vacuum targets the player, not their creatures. A commander with hexproof or protection from blue may be returned this way.
No other card is named in this ruling.
#2August 23, 2019· Wizards of the Coast
You'll draw a card even if the target player controls no commanders as Leadership Vacuum resolves.
No other card is named in this ruling.
#3August 23, 2019· Wizards of the Coast
The "commander tax" increases based on how many times a commander was cast from the command zone, not how many times it was put there as a result of Commander rules. The returned commander will cost more to cast again even though it was put directly into the command zone.
No other card is named in this ruling.