Cheapest priced copy (Magic 2012): $0.35 at Card Kingdom, near mint, their price list as of .
Timely Reinforcements 
Sorcery · Uncommon · The List · #M12-40
If you have less life than an opponent, you gain 6 life. If you control fewer creatures than an opponent, create three 1/1 white Soldier creature tokens.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2012 | 40 | Uncommon | $0.35 | $0.79 |
| The List | M12-40 | Uncommon | $0.35 | — |
3 rulings from Wizards of the Coast
- 22 September 2011In a Two-Headed Giant game, you’ll compare your team’s life total with the opposing team’s life total. You’ll then compare the number of creatures you control (ignoring creatures your teammate controls) to the number of creatures each opponent controls separately.
- 22 September 2011You compare life totals with each of your opponents when Timely Reinforcements resolves. At that time, if you have less life than an opponent, you’ll gain 6 life. Similarly, you compare the number of creatures you control with the number of creatures each opponent controls when Timely Reinforcements resolves.
- 22 September 2011In a multiplayer game, you consider each opponent. If you have less life than one of your opponents and fewer creatures than one of your opponents (although this may be a different opponent), you’ll get both bonuses.