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He's a four-mana card drawing engine for any deck that Is gagging for card drawing, like White or Red

There's a few reasons for that

Ace, and Enel are your strongest late-game plays, providing a Life card while acting as large, hard-to-remove bodies

In Standard Magda, Brazen Outlaw makes a lot of mana really quickly in combination with Jaspera Sentinel

I think of Vantress as like a second Extravagant Replication for artifacts and enchantments, allowing you to get more Court of Ambition triggers if you can make enough

If the copied creature is copying something else, then Synth Infiltrator enters the battlefield as whatever that creature copied, with the noted exceptions