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[popsofctown]

If you play Remodel with no cards in hand, can you gain a card costing up to 2$?

Because on Iso when I played a Forge trashing nothing, I expected to gain nothing, but gained a copper instead.

[ftl]

http://forum.dominionstrategy.com/index.php?topic=1117

[ftl]

To summarize:

When you play remodel or expand with no cards in hand, you do not gain anything; you need to gain something costing $2/$3 more than the trashed card, and there was no trashed card, so "Costing X more than the trashed card" makes no sense.

For Forge, well, I'll just quote the FAQ: 

If you trash no cards, you have to gain a card costing 0 if you can. This is different from how cards like Expand work if you do not trash anything, because Forge looks at the total, not at any one card's cost."

So the total cost of all the cards you trashed is zero (because you didn't trash anything).

[popsofctown]

Ergh.  To me it feels like I'm dereferencing a null pointer either way.

[AJD]

Ergh.  To me it feels like I'm dereferencing a null pointer either way.

The difference is that Forge references a set, and Remodel references a card. The empty set is still a set, but it's not a card.

[DStu]

Ergh.  To me it feels like I'm dereferencing a null pointer either way.

The trick is that 'summing over all elements of an empty set' is a well-defined operation with return value 0.  You don't need to dereference the null pointer, because the operation 'sum' does not need to do this but returns "0" as soon as it sees the null-pointer.

[SirPeebles]

I want to say that it makes me really happy that so many people here get this.  It's so hard sometimes to get my students to understand the difference between zero, the empty set, and nothing.