Swans of Bryn Argol are highly unusual and crop up mostly as a way to draw cards rather than as a threat however it ends up winning a reasonable number of games simply by being a fairly big evasive monster that is hard to stop
Typically, cards can either give you tempo (generate a presence on the board) or give you value (keep your hand full of cards to play later)
The spells and trap cards should cover for the weaknesses of your deck, and you should have a handful of each of the following: attack protection, effect negation, summon negation, spell/trap destruction
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It is very effective, and Air Fo is especially excellent as a "Normal Trap that can only be activated when an attack is declared" specified by the Demon Statue
These options allow you to tailor your collection to your preferred play style and ensure that you have the cards you need to build a competitive deck