Cheapest priced copy (Duel Decks: Elspeth vs. Tezzeret): $2.29 at Card Kingdom, near mint, their price list as of .
Catapult Master 
Creature — Human Soldier · 3/3 · Rare · Onslaught · #10
Tap five untapped Soldiers you control: Exile target creature.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $2.29 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Elspeth vs. Tezzeret | 18 | Rare | $2.29 | — |
| Onslaught | 10 | Rare | $2.29 | $12.99 |
One ruling from Wizards of the Coast
- 4 October 2004You may tap any untapped permanents you control with the appropriate creature type (including this creature) to pay the cost of the ability, including creatures that haven't been under your control continuously since the beginning of your most recent turn.