Incubation Druid is a rare Creature — Elf Druid card from Ravnica Allegiance Promos (PRNA), collector number 131p. Current market price: $1.83 (foil $5.29), 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.)