Sorcery, XX2WW (4) Put X 4/4 white Angel creature tokens with flying into play. Cycling {2}{W} When you cycle Decree of Justice, you may pay {X}. If you do, put X 1/1 white Soldier creature tokens into play.
Illus. Adam Rex
The two X's in the mana cost mean that you pay 2 mana (above the {2}{W}{W} base cost) for each token you want to create. [Scourge FAQ 2003/05/30]
When you cycle this card, the last ability triggers. When that ability resolves, you choose a value of X and pay it during resolution. [Scourge FAQ 2003/05/30]