Prototype Portal

If the exiled card has in its mana cost (such as Chalice of the Void), that X is considered to be 0. The 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 is undefined and can't be paid.

2011-01-01

You don't choose the value of . Rather, the value of X is defined by the activated ability.

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