Cheapest priced copy (Assassin's Creed): $3.99 at Card Kingdom, near mint, their price list as of .
Propaganda 
Enchantment · Uncommon · Forgotten Realms Commander · #91
Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
19 printings · $3.99 to $18.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Assassin's Creed | 85 | Uncommon | $3.99 | $4.49 |
| Assassin's Creed | 195 | Uncommon | — | — |
| Forgotten Realms Commander | 91 | Uncommon | $4.49 | — |
| Commander 2013 | 53 | Uncommon | $4.99 | — |
| Commander 2016 | 94 | Uncommon | $4.99 | — |
| Commander 2020 | 123 | Uncommon | $4.49 | — |
| Commander Legends: Battle for Baldur's Gate | 730 | Uncommon | $4.49 | — |
| Commander 2011 | 55 | Uncommon | $7.99 | — |
| Foundations Commander | 72 | Uncommon | $3.99 | — |
| Final Fantasy Commander | 268 | Uncommon | $3.99 | $6.99 |
| Modern Horizons 3 Commander | 191 | Uncommon | $3.99 | $7.99 |
| Marvel Super Heroes Commander | 151 | Uncommon | $3.99 | $5.99 |
| Outlaws of Thunder Junction Commander | 108 | Uncommon | $3.99 | — |
| The List | C16-94 | Uncommon | $4.49 | — |
| Secret Lair Drop | 1633 | Rare | $15.99Out of stock | — |
| Secret Lair Drop | 1633★ | Rare | — | $18.99 |
| Tempest | 80 | Uncommon | $8.49 | — |
| Doctor Who | 219 | Uncommon | $4.99 | $5.99Out of stock |
| Doctor Who | 810 | Uncommon | — | $12.99 |
6 rulings from Wizards of the Coast
- 4 October 2004Paying this cost is not an instant or any other kind of ability, it is an additional cost on the declaration of the attacker.
- 4 October 2004The payment is made during the declare attackers step at the same time you are declaring the attacker.
- 4 October 2004If there are multiple attacks in a turn, then you have to pay for each attack.
- 4 October 2004If there is more than one Propaganda on the battlefield, the cost is cumulative.
- 1 February 2007In the Two-Headed Giant format, you still only have to pay once per creature.
- 1 February 2014Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.