Obviously its not really worth spending two mana and a card to turn your worst creature into the best creature on the battlefield, but what about a spell that can either do that or turn your opponents best creature into the worst creature on the battlefield
Black Salvo X DARK Level 3 [ Machine / TunerEffect ] ATK 100 DEF 1100 When this card is Normal Summoned: You can target 1 Level 4 DARK Machine-Type monster in your Graveyard
7: You get an emblem with "Tap an untapped artifact you control: This emblem deals 1 damage to any target." 1: Pay any amount of mana
We were also eager to open more ways for you to interact with cards like you'd usually be able to do, like bouncing them or using "flickering" or "sliding" effects that exile these cards and return them to the battlefield for their entering effects
Despite this, the archetype did have an incredible generic synchro monster that rewarded players for strategically planning the materials that they used to summon it, as Metaphys Horus is an amazingly intricate card
That alone would make it playable