Cheapest priced copy (Edge of Eternities): $0.49 at Card Kingdom, near mint, their price list as of .
Dyadrine, Synthesis Amalgam 
Legendary Artifact Creature — Construct · 0/1 · Rare · Edge of Eternities · #298
Trample
Dyadrine enters with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.
Whenever you attack, you may remove a +1/+1 counter from each of two creatures you control. If you do, draw a card and create a 2/2 colorless Robot artifact creature token.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Edge of Eternities | 216 | Rare | $0.49 | $0.49 |
| Edge of Eternities | 298 | Rare | $0.79 | $1.99 |
| Edge of Eternities Promos | 216p | Rare | $0.49 | $0.49 |
| Edge of Eternities Promos | 216s | Rare | — | $0.69 |
4 rulings from Wizards of the Coast
- 25 July 2025If an effect allows you to cast Dyadrine without paying its mana cost, X will be 0.
- 25 July 2025If an effect requires you to pay some amount of mana to prevent Dyadrine from being countered, as Divert Disaster does, that mana wasn’t spent to cast Dyadrine and will not be taken into account for Dyadrine’s second ability.
- 25 July 2025If a copy of Dyadrine is created on the stack, no mana was spent to cast the copy. The amount of mana spent to cast the original spell is not copied.
- 25 July 2025Dyadrine’s second ability cares about the amount of mana that was actually paid to cast Dyadrine. Any effects that increase or decrease the cost to cast it (including the “commander tax” in a Commander game) will also be taken into account.