Cheapest priced copy (Rise of the Eldrazi): $0.35 at Card Kingdom, near mint, their price list as of .
Hand of Emrakul 
Creature — Eldrazi · 7/7 · Common · Rise of the Eldrazi · #5
You may sacrifice four Eldrazi Spawn rather than pay this spell's mana cost.
Annihilator 1 (Whenever this creature attacks, defending player sacrifices a permanent of their choice.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Rise of the Eldrazi | 5 | Common | $0.35 | $7.99 |
5 rulings from Wizards of the Coast
- 15 June 2010Annihilator abilities trigger and resolve during the declare attackers step. The defending player chooses and sacrifices the required number of permanents before they declare blockers. Any creatures sacrificed this way won't be able to block.
- 15 June 2010If a creature with annihilator is attacking a planeswalker, and the defending player chooses to sacrifice that planeswalker, the attacking creature continues to attack. It may be blocked. If it isn't blocked, it simply won't deal combat damage to anything.
- 15 June 2010Casting Hand of Emrakul by paying its alternative cost doesn't change when you can cast it. You can cast it only at the normal time you could cast a creature spell.
- 15 June 2010Casting Hand of Emrakul by paying its alternative cost doesn't change its mana cost or mana value.
- 15 June 2010Effects that increase or reduce the cost to cast Hand of Emrakul will apply to it even if you choose to pay its alternative cost.