Cheapest priced copy (Fallout): $9.49 at Card Kingdom, near mint, their price list as of .
Branching Evolution 
Enchantment · Rare · The Lost Caverns of Ixalan Commander · #234
If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
7 printings · $9.49 to $24.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart | 29 | Rare | $11.99 | — |
| The Lost Caverns of Ixalan Commander | 234 | Rare | $10.99 | — |
| Modern Horizons 3 | 285 | Rare | $9.99 | $12.99 |
| Fallout | 195 | Rare | $9.49 | $15.99 |
| Fallout | 468 | Rare | $15.99 | $24.99Out of stock |
| Fallout | 723 | Rare | — | $16.99 |
| Fallout | 996 | Rare | — | $19.99 |
3 rulings from Wizards of the Coast
- 23 June 2020If a creature you control would enter the battlefield with a number of +1/+1 counters on it, it enters with twice that many instead.
- 23 June 2020If two or more effects attempt to modify how many counters would be put onto a creature you control, you choose the order to apply those effects, no matter who controls the sources of those effects.
- 23 June 2020If you control two Branching Evolutions, the number of +1/+1 counters put on a creature is four times the original number. Three Branching Evolutions multiplies the original number by eight, and so on.