Cheapest priced copy (Khans of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Incremental Growth 
Sorcery · Uncommon · Lorwyn · #221
Put a +1/+1 counter on target creature, two +1/+1 counters on another target creature, and three +1/+1 counters on a third target creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 138 | Uncommon | $0.35 | $0.49 |
| Lorwyn | 221 | Uncommon | $0.35 | $0.49 |
| Modern Masters | 149 | Uncommon | $0.35 | $0.49 |
| The List | LRW-221 | Uncommon | $0.35 | — |
| Welcome Deck 2016 | 14 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 20 September 2014You must choose three different targets in order to cast Incremental Growth. You decide how many +1/+1 counters each creature will get as part of casting the spell.
- 20 September 2014If some of the creatures are illegal targets as Incremental Growth tries to resolve, the remaining legal targets still get the appropriate number of +1/+1 counters. If all targets are illegal, Incremental Growth doesn’t resolve.