Cheapest priced copy (Foundations Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Parapet Thrasher 
Creature — Dragon · 4/3 · Rare · Foundations Commander · #170
Flying
Whenever one or more Dragons you control deal combat damage to an opponent, choose one that hasn't been chosen this turn —
• Destroy target artifact that opponent controls.
• This creature deals 4 damage to each other opponent.
• Exile the top card of your library. You may play it this turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.99 to $2.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Commander | 170 | Rare | $0.99 | — |
| Tarkir: Dragonstorm Commander | 36 | Rare | $1.79 | — |
| Tarkir: Dragonstorm Commander | 76 | Rare | $2.29 | — |
2 rulings from Wizards of the Coast
- 4 April 2025If the triggered ability triggers more than three times in a turn, no mode can be chosen for any instances of the ability after the third, and those will be removed from the stack and do nothing.
- 4 April 2025You pay all costs and follow all timing rules for cards played this way. For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty.