If a meld card is cast as a spell, its put on the stack with its front face up
Sure, you'll have to wait four turns until you can start attacking with it if you cast it this way, but that isn't really a problem when you consider the amount of ramp you're getting from doing so
Imagine this in an Izzet deck with something like the token making Brudiclad, Telchor Engineer that also happens to make artifacts, or the power of Treasure making with the counter Spell Swindle
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Even if you never transform it by sacrificing Clue tokens, it pulls a lot of weightbut you almost always find a good target
With this combo you can force every other player to sacrifice all of their creatures