Prototype Portal {4}

Name: Prototype Portal (Commander 2018)
Brand: Magic: The Gathering
SKU: e2ccdd3b-9c39-4785-99b9-64b5de1177be

Artifact

Imprint — When Prototype Portal enters, you may exile an artifact card from your hand.

{X}, {T}: Create a token that’s a copy of the exiled card. X is the mana value of that card.

Illustrated by Drew Baker

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Faces, Tokens, & Other Parts
Prototype Portal, C18 #216
Copy Token, TFDN #26

Prints	USD	EUR	TIX
The List	$2.04
Commander 2018	$0.57	€0.28
Scars of Mirrodin	$0.62	€0.31	0.02
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If Prototype Portal has left the battlefield by the time its second ability resolves, you'll still put a token onto the battlefield that's a copy of the exiled card. On the other hand, if Prototype Portal is still on the battlefield at this time but there is no exiled card (because, perhaps, Riftsweeper's ability caused the exiled card to be put into its owner's library), no token is created. (2011-01-01)
You don't choose the value of {X}. Rather, the value of X is defined by the activated ability. (2011-01-01)
If the exiled card has {X} in its mana cost (such as Chalice of the Void), that X is considered to be 0. The {X} in Prototype Portal's activation cost takes this into account, though it may be greater than 0 if the exiled card has other mana symbols in its mana cost (such as Riptide Replicator). (2011-01-01)

You may not activate the second ability if no card has been exiled with Prototype Portal. In that case, the value of {X} is undefined and can't be paid. (2011-01-01)
Any "enters" abilities of the exiled card will trigger when the token is put onto the battlefield. Any "as [this permanent] enters" or "[this permanent] enters with" abilities of the exiled card will also work. (2011-01-01)