Cheapest priced copy (March of the Machine): $2.29 at Card Kingdom, near mint, their price list as of .
Heliod, the Radiant Dawn // Heliod, the Warped Eclipse 
Legendary Enchantment Creature — God // Legendary Enchantment Creature — Phyrexian God · 4/4 · Rare · March of the Machine · #17
When Heliod enters, return target enchantment card that isn't a God from your graveyard to your hand.
{3}{U/P}: Transform Heliod. Activate only as a sorcery. ({U/P} can be paid with either {U} or 2 life.)
You may cast spells as though they had flash.
Spells you cast cost {1} less to cast for each card your opponents have drawn this turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $2.29 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 17 | Rare | $2.29 | $2.49 |
| March of the Machine | 293 | Rare | $2.49 | $3.99 |
| March of the Machine Promos | 17s | Rare | — | $2.99 |
6 rulings from Wizards of the Coast
- 14 April 2023If a spell you cast has {X} in its mana cost, you choose the value of X before calculating the spell’s total cost. For example, if a spell’s mana cost is {X}{R} and your opponents have drawn two cards this turn, you could choose 5 as the value of X and pay {3}{R} to cast the spell.
- 14 April 2023If 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.
- 14 April 2023The “as though they had flash” effect applies only to casting spells. It does not, for example, change when you may activate abilities that can be activated “only as a sorcery.”
- 14 April 2023That ability can’t reduce the amount of colored mana you pay for a spell. It reduces only the generic mana component of that cost.
- 14 April 2023The last ability of Heliod, the Warped Eclipse doesn’t change the mana cost or mana value of any spell. It changes only the total cost you pay.
- 14 April 2023The cost reduction can apply to alternative costs such as flashback costs.