Cheapest priced copy (Fallout): $0.49 at Card Kingdom, near mint, their price list as of .
Synth Eradicator 
Artifact Creature — Synth Soldier · 3/3 · Rare · Fallout · #67
Haste
Whenever this creature attacks, exile the top card of your library. You may get {E}{E} (two energy counters). If you don't, you may play that card this turn.
{T}, Pay {E}{E}{E}: This creature deals 3 damage to any target.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.49 to $2.99 at Card Kingdom
One ruling from Wizards of the Coast
- 8 March 2024You pay all costs and follow all normal timing rules for the card played from exile with Synth Eradicator's second ability. For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty.