Cheapest priced copy (The List): $2.29 at Card Kingdom, near mint, their price list as of .
Groundbreaker 
Creature — Elemental · 6/1 · Rare · Planar Chaos · #148
Trample, haste
At the beginning of the end step, sacrifice this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $2.29 to $64.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Champs and States | 8 | Rare | — | $64.99 |
| Planar Chaos | 148 | Rare | $2.99 | $4.99 |
| The List | PLC-148 | Rare | $2.29 | — |
One ruling from Wizards of the Coast
- 1 February 2007The creature is sacrificed at the end of every turn in which it is on the battlefield. There is no choice about what turn to sacrifice it.