Propaganda

Mana cost: {2}{U}
Type: Enchantment
Set: The List #C16-94 (uncommon)
Price: $2.68 USD

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Propaganda has 21 printings, first in Tempest (1997). EDHREC ranks it #110 among Commander cards. It appears most in Y'shtola, Night's Blessed decks (44,056 on EDHREC). 13 public decks on TCG run it. It has 6 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 Propaganda

Doom Prevails - Marvel Super Heroes, led by Doctor Doom, King of Latveria
Draconic Dissent - Commander Legends: Battle for Baldur's Gate, led by Firkraag, Cunning Instigator
Dungeons of Death - Forgotten Realms Commander, led by Sefris of the Hidden Ways
Enhanced Evolution - Commander 2020, led by Otrimi, the Ever-Playful
Heads I Win, Tails You Lose - Secret Lair Drop, led by Zndrsplt, Eye of Wisdom
Keen Engineering - Foundations Commander, led by Sai, Master Thopterist
Masters of Evil - Doctor Who, led by Davros, Dalek Creator
Mind Seize - Commander 2013, led by Jeleva, Nephalia's Scourge
Political Puppets - Commander 2011, led by Zedruu the Greathearted
Quick Draw - Outlaws of Thunder Junction Commander, led by Stella Lee, Wild Card
Scions & Spellcraft - Final Fantasy Commander, led by Y'shtola, Night's Blessed
Stalwart Unity - Commander 2016, led by Kynaios and Tiro of Meletis
Tricky Terrain - Modern Horizons 3 Commander, led by Omo, Queen of Vesuva

Commanders that run Propaganda most

Deck counts from EDHREC.

Y'shtola, Night's Blessed: 44,056 decks
Nekusar, the Mindrazer: 15,667 decks
Oloro, Ageless Ascetic: 12,570 decks
Ms. Bumbleflower: 12,476 decks
Grand Arbiter Augustin IV: 10,938 decks
Hope Estheim: 10,502 decks
Zur the Enchanter: 10,134 decks
Jon Irenicus, Shattered One: 9,071 decks

Often played with Propaganda

Cards that show up in the same decks on EDHREC.

Rulings

2004-10-04: Paying this cost is not an instant or any other kind of ability, it is an additional cost on the declaration of the attacker.
2004-10-04: The payment is made during the declare attackers step at the same time you are declaring the attacker.
2004-10-04: If there are multiple attacks in a turn, then you have to pay for each attack.
2004-10-04: If there is more than one Propaganda on the battlefield, the cost is cumulative.
2007-02-01: In the Two-Headed Giant format, you still only have to pay once per creature.
2014-02-01: Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.