Cost one less to cast

[Curious penguin]

If a card says instants or sorccery cost 1 less to play. Does that count for cards that cost one mountain or whatever? I mean can you use it for a land of a certain color?

[D3g3n]

If it says one (like older cards) or have a colourless one mana symbol, it is referring to one colourless less.
If it were for a particular colour, it will say one less [colour] to cast (or have the mana symbol).

[BlackJester]

A {2}{R} would cost {1}{R}.
A {R} will still cost {R}.

[Kaleo42]

Jester, can you explain what alternative costs are effected by these effects. Such as miracle, kicker, {X} costs, etc.

[BlackJester]

All.

When determining how much mana you pay for the spell you take the initial cost  + additional costs (kicker, {Thalia, Guardian of Thraben}) - reductions.

Alternate costs that don't require mana are unaffected by reductions (giving life with {Invigorate}).

The cost can't be reduced below {0}, and colorless reductions cannot lower colored costs. {Geth's Verdict} still costs {B}{B}.

[Lespend]

I'm throwing a wrench out... {sphere of resistance}... This I completely different right? I run {grand Arbitor Augustine the IV} as my general and the sphere makes me pay another colorless mana when my general is in play right even if with the mana reduction in example when I cast {enlightened tutor} I would pay 2?

[Lespend]

I mean I would pay 1 white and 1 colorless?

[BlackJester]

To figure out what you have to pay, you take the original cost ({W} in your example), add additional costs (+{1} for the sphere). Then subtract deductions (-{1} for your Arbiter).

This gives a total of {W}+{1}-{1}={W}.

That's it.

[Lespend]

I hate it when judges argue with me about this... I was told that the additional cost is applied after all "initial costs" are determined... So you pay the cost of the spell then pay the additional costs... I explained it the same way you did and he ruled that I was wrong...

[Quisequise]

Would this one less to cast effect Replicate costs?

[scarsabrex]

Would this one less to cast effect Replicate costs?

not each replicate cost if that is what you're suggesting. it'll take one away from the total casting cost.

[Richardalcala]

How does it work for a miracle? Could I get another angel?