Cheapest priced copy (Magic 2010): $0.35 at Card Kingdom, near mint, their price list as of .
Alluring Siren 
Creature — Siren · 1/1 · Uncommon · Magic 2012 · #42
{T}: Target creature an opponent controls attacks you this turn if able.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2010 | 43 | Uncommon | $0.35 | $0.99 |
| Magic 2011 | 43 | Uncommon | $0.35 | $0.49 |
| Magic 2012 | 42 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 1 October 2009After the ability resolves, the targeted creature attacks you only if it’s able to do so as that turn’s declare attackers step begins. If, at that time, the creature is tapped, is affected by a spell or ability that says it can’t attack, or is affected by “summoning sickness,” it can’t attack. If there’s a cost associated with having that creature attack, its controller isn’t forced to pay that cost, so the creature doesn’t have to attack in that case either.
- 1 October 2009If the targeted creature would be able to attack either you or a planeswalker you control, it must attack you, not the planeswalker.
- 1 October 2009Activating the ability during your opponent’s turn after attackers have been declared will have no effect. The same is true if you activate the ability during your own turn.