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Its intended synergy seems to be to special summon multiple Monsters with Ride of the Valkyries to Special Summon multiple Valkyrie Monsters, attack with them, and then use this to get a second attack in while bypassing the negative effect to shuffle all Monsters you control into your deck (or any other maintenance cost for that matter)

Mutate decks just got an alternate win condition

Flavor Text To find Jadzi, one need only wander

during this turns Main Phase, you can Normal Summon (not Set) 1 Simorgh monster in addition to your Normal Summon/Set (you can only gain this effect once per turn)

July 17 NJ, Old Bridge

Similarly, an ability of another card that instructs you to "transform" one of these cards will cause you to convert it, even if that ability doesn't use the word "convert." More Than Meets the Eye notes: "More Than Meets the Eye [cost]" means "You may cast this card converted by paying [cost] rather than its mana cost." It functions in any zone from which the spell can be cast