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You can use the loyalty ability immediately, and keep it as long as your Dragonlord is around to keep it Seduced with Power

The difference is that while they have an ink cost on them, there is also an extra block of text in the description area of the card which details that you can exert a character (turning them sideways and opening them to attack) of a minimum cost in order to play the song card for free

(2014-11-24) Each Siege will have one of the two listed abilities, depending on your choice as it enters the battlefield

As such, Zigfried was able to modify its effect and give Leon a huge advantage when he used the card in his duel against Yugi