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It is a great card you can search via Lo, the Prayers of the Voiceless Voice, when you already have access to Barrier of the Voiceless Voice

"Steelswarm Mantis" is a 1 Tribute Monster which can revive a Steelswarm from GY

Since this deck cares about stealing cards from your opponent and casting them, Savvy Trader will reduce a lot of spell costs of cards you steal from your opponent

Special Summon this card from your Graveyard, then, you can attach 1 "Super Defense Robot" monster from your Graveyard to this card as an Xyz Material

Theres an online mode as well, although its not always easy to get hold of another player