Incubation Druid is a rare Creature — Elf Druid card from Ravnica Allegiance (RNA), collector number 131. Current market price: $2.60 (foil $6.06), TCGplayer market prices via Scryfall.
{T}: Add one mana of any type that a land you control could produce. If this creature has a +1/+1 counter on it, add three mana of that type instead. {3}{G}{G}: Adapt 3. (If this creature has no +1/+1 counters on it, put three +1/+1 counters on it.)