Cheapest priced copy (Commander 2021): $0.49 at Card Kingdom, near mint, their price list as of .
Sequence Engine 
Artifact · Rare · Commander 2021 · #394
{X}, {T}: Exile target creature card with mana value X from a graveyard. Create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it. Activate only as a sorcery.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $0.59 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2021 | 67 | Rare | $0.49 | — |
| Commander 2021 | 394 | Rare | $0.59 | — |