Ruby Medallion {2}

Artifact

Red spells you cast cost {1} less to cast.

Prints	USD	EUR	TIX
Modern Horizons 3 #295	$5.92	€4.43	0.08
Modern Horizons 3 #348	$8.16		0.34
Commander Masters #405	$5.74	€5.07	1.73
Commander Masters #613	$13.60		2.79
Commander Anthology Volume II	$5.45	€3.82
Commander 2014	$6.53	€4.89	1.71
Tempest	$26.36	€15.65	3.57
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The ability doesn't change the mana cost or mana value of any spell. It changes only the total cost you pay. (2023-07-28)
The ability can't reduce the amount of colored mana you pay for a spell. It reduces only the generic mana component of that cost. (2023-07-28)
If there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect (such as the one created by Thalia, Guardian of Thraben's ability), apply those increases before applying cost reductions. (2023-07-28)

The cost reduction can apply to alternative costs such as flashback costs. (2023-07-28)
If a spell you cast has {X} in its mana cost, you choose the value of X before calculating the spell's total cost. (2023-07-28)