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It is very important for the Deck's playing style that "Shari" remains in circulation to further the Deck's plays, so the effects that can detach it from the "Gunkan" Xyz Monsters after their on-Summon effects have been used can be useful, such as "Time Thief Winder" or the searchable Counter Trap Card "Xyz Block"

If you want to see the card in action make sure to check out this week's Against the Odds , but the short version is that Soul Spike works incredibly well with Necrodominance

Tap Mox Opal for mana (notably a source of colored mana), then sacrifice it to KCI

I also think the deck out of the box is too reliant on the commander to draw cards