Propaganda - mtg.wtf

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 is more than one Propaganda on the battlefield, the cost is cumulative.
2004-10-04 If there are multiple attacks in a turn, then you have to pay for each attack.
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.
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.

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