Okay so making a Grixis Commander Deck. Let's say I play Lazav, the multifarious and surveil a Kroxa, Titan of Death's Hunger and send it to GY. Following turn I use Lazav's "X" ability to copy Kroxa from GY. Then play "Spark Double" targeting my Lazav. Would that make another copied Kroxa named Lazav? And will spark doubles not legendary go around lazavs ability that would make it legendary? Main thing is trying to get 3 Kroxas on the field eventually but didn't know if possible.
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-MadMage
If you have Lazav become a copy of Kroxa, it will have Kroxa's copiable values, "except [among other things] its name is Lazav, the Multifarious [and] it's legendary in addition to its other types"; these changes will become part of Lazav's copiable values (C.R. 706.2, 706.9c). And if you then have Spark Double become a copy of Lazav (which will be legendary), Spark Double will have its copiable values, "except ... [among other things] it isn't legendary if that permanent is legendary" (C.R. 706.2, 706.9c). (But if you now control two or more permanents named Lazav, the Multifarious, only one of which is legendary, the legend rule won't apply [C.R. 704.5j].)
One thing worth pointing out is that if you copy Lazav *while* it is Kroxa, Spark Double enters as Kroxa. You already seem to know this part, but that means you just had a Kroxa enter that wasn't Escaped so you need to sacrifice it. If you copy Lazav before Lazav turns into Kroxa, you can activate both to be a Kroxa after they are on the field though then you hit the Legendary rule since the activated ability makes it Legendary again. I don't see this being a good way to get 3 Kroxa's on the board.
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-MadMage
[c]Kroxa, Titan of Death's Hunger[/c] = Kroxa, Titan of Death's Hunger
Spark Double
Lazav, the Multifarious
One thing worth pointing out is that if you copy Lazav *while* it is Kroxa, Spark Double enters as Kroxa. You already seem to know this part, but that means you just had a Kroxa enter that wasn't Escaped so you need to sacrifice it. If you copy Lazav before Lazav turns into Kroxa, you can activate both to be a Kroxa after they are on the field though then you hit the Legendary rule since the activated ability makes it Legendary again. I don't see this being a good way to get 3 Kroxa's on the board.