# Can I cast cost-less cards like Living End with Dream Halls?

I think the title is self-explaining :)

Can I cast cost-less cards like Living End with Dream Halls by discarding a black card ?

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Yes.

Living End has a mana cost of "unpayable".

Dream Halls introduces an alternative cost of "discard a card that shares a color with the spell".

total cost
= (mana cost or alternative cost) + (additional costs and cost increases) - cost reductions
= discard a card that shares a color with the spell

117.6. Some mana costs contain no mana symbols. This represents an unpayable cost. [...]

117.6a [...] If an alternative cost is applied to an unpayable cost, including an effect that allows a player to cast a spell without paying its mana cost, the alternative cost may be paid.

Just in case there's any doubt, Living End is black.

204.2. An object with a color indicator is each color denoted by that color indicator.

(It had a characteristic-defining ability when it was printed, but it now has a color indicator. Characteristic-defining abilities work in all zones, so the answer would have been the same before the change.)

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What is the colour indicator? The black frame? – doppelgreener Feb 18 '14 at 10:48
@JonathanHobbs, A dot next to the types. Compare magiccards.info/fut/en/78.html and magiccards.info/mma/en/97.html – ikegami Feb 18 '14 at 12:17

It says "Rather than pay the mana cost for a spell". Since it doesn't have a mana cost it has no effect on cards with no mana cost.

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-1; Dream Halls creates an alternative cost for the spell. – Brian S Feb 17 '14 at 20:00
My bad. Didn't know 117.6a. A lot of rules questions actually can be answered by just reading the text. Guess this is one of the many exceptions. – Ivo Beckers Feb 17 '14 at 22:51
Has nothing to do with 117.6a. Casting a spell for an alternative cost rather than a mana cost doesn't require the card to have a mana cost. – ikegami Feb 18 '14 at 3:05