Pure mathematics is the world's best game. It is more absorbing than chess, more of a gamble than poker, and lasts longer than Monopoly. It's free. It can be played anywhere - Archimedes did it in a bathtub
When you activate the Portus, can you choose it as the card to exchange with one from your hand, or you must target another card other than Portus?
The text on the card doesn't clarify this. Thanks.
We always played as you can choose any card (including the portus card itself), but as you said is not totally clear