As
Sky Shadow does 3 damage to an Autobot when it combines, this is a very relevant question. The answer is that you resolve the card's contents first, and then resolve any effects that triggered in reverse order. This means that you flip
Metroplex to alt mode, triggering his deploy effect, then you move the damage to KO the Sky Shadow piece. This event triggers a new effect, the combining of Sky Shadow, and the Sky Shadow player chooses an Autobot to do 3 damage to. Lastly, you return to your stack of triggered effects and deploy your Metroplex minion.
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As Sky Shadow does 3 damage to an Autobot when it combines, this is a very relevant question. The answer is that you resolve the card's contents first, and then resolve any effects that triggered in reverse order. This means that you flip Metroplex to alt mode, triggering his deploy effect, then you move the damage to KO the Sky Shadow piece. This event triggers a new effect, the combining of Sky Shadow, and the Sky Shadow player chooses an Autobot to do 3 damage to. Lastly, you return to your stack of triggered effects and deploy your Metroplex minion.