Tempest
Artifact
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Color profile
Colorless
Format check
Official notes
The ability doesn't change the mana cost or mana value of any spell. It changes only the total cost you pay.
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.
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.
The cost reduction can apply to alternative costs such as flashback costs.
If a spell you cast has {X} in its mana cost, you choose the value of X before calculating the spell's total cost.
Public deck signals
Cards found together in sampled public decks. Lands are excluded and different printings count as one card. This suggests shared play, not a proven combo.
Same Oracle card
