
Creatures can't attack you unless their controller pays for each creature they control that's attacking you.
"The cost of your opposition will be extracted from your wits." —Nekusar, the Mindrazer
Illustrated by Clint Cearley · Outlaws of Thunder Junction Commander · #108
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.
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.