Cheapest priced copy (Commander Legends: Battle for Baldur's Gate): $2.29 at Card Kingdom, near mint, their price list as of .
Goblin Spymaster 
Creature — Goblin Rogue · 2/1 · Rare · Commander Legends: Battle for Baldur's Gate · #795
First strike
At the beginning of each opponent's end step, that player creates a 1/1 red Goblin creature token with "Creatures you control attack each combat if able."
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $2.29 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2016 | 19 | Rare | $2.99 | — |
| Commander Legends: Battle for Baldur's Gate | 795 | Rare | $2.29 | — |
One ruling from Wizards of the Coast
- 8 November 2016If, during your declare attackers step, a creature you control is tapped or is affected by a spell or ability that says it can't attack, then it doesn't attack, even if you control one of Goblin Spymaster's tokens. If there's a cost associated with having a creature attack, you aren't forced to pay that cost, so it doesn't have to attack in that case either.