Cheapest priced copy (Dragons of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Qal Sisma Behemoth 
Creature — Ogre Warrior · 5/5 · Uncommon · Dragons of Tarkir · #149
This creature can't attack or block unless you pay {2}.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dragons of Tarkir | 149 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 25 February 2015If an effect says that Qal Sisma Behemoth must attack or block if able, you can choose not to pay the associated cost and ignore that requirement. Players are never forced to pay a cost to attack or block.