Curse of Inertia

Mana cost: {2}{U}
Type: Enchantment — Aura Curse
Set: Commander 2013 #36 (uncommon)
Price: $0.30 USD

Enchant player
Whenever a player attacks enchanted player with one or more creatures, that attacking player may tap or untap target permanent of their choice.

Curse of Inertia has 2 printings, first in Commander 2013 (2013). EDHREC ranks it #15,078 among Commander cards. It appears most in Lynde, Cheerful Tormentor decks (2,752 on EDHREC). 4 public decks on TCG run it. It has 7 official rulings.

Legality

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

Public decks that run Curse of Inertia

Eternal Bargain - Commander 2013, led by Oloro, Ageless Ascetic
Evasive Maneuvers - Commander 2013, led by Derevi, Empyrial Tactician
Evasive Maneuvers - Commander Anthology, led by Derevi, Empyrial Tactician
Mind Seize - Commander 2013, led by Jeleva, Nephalia's Scourge

Commanders that run Curse of Inertia most

Deck counts from EDHREC.

Lynde, Cheerful Tormentor: 2,752 decks
The Unluckiest Planeswalker: 275 decks
Ardenn, Intrepid Archaeologist // Ludevic, Necro-Alchemist: 24 decks
The Eleventh Doctor: 2 decks

Often played with Curse of Inertia

Cards that show up in the same decks on EDHREC.

Rulings

2013-10-17: Each of the Curses can be attached to any player, including the player who cast the Curse.
2013-10-17: Curse is an enchantment type, not a creature type (or any other kind of subtype).
2013-10-17: The Curse subtype has no inherent rules meaning, but two cards in the Innistrad set (Bitterheart Witch and Witchbane Orb) refer to Curses.
2013-10-17: Curse of Inertia’s ability will trigger only once per attacking player per combat phase, no matter how many creatures that player attacks with.
2013-10-17: A Curse spell targets the player it will enchant like any other Aura spell, and a Curse stays on the battlefield like any other Aura. If the enchanted player gains protection from the Curse’s color (or any other characteristic the Curse has), the Curse will be put into its owner’s graveyard.
2013-10-17: Even though the attacking player chooses the target of the ability, the ability is still controlled by the player who controls Curse of Inertia. Notably, a creature with hexproof controlled by the player who controls Curse of Inertia could be chosen, even though another player may be choosing the target.
2013-10-17: The ability won’t trigger when a creature attacks a planeswalker controlled by the enchanted player.