At the beginning of your upkeep, Battlefield Oasis deals 2 damage to target creature you control.

: Add  to your mana pool. Activate this ability only if you control a Mountain.

: Add  to your mana pool. Activate this ability only if you control a Forest.

: Battlefield Oasis becomes a 2/1 red and green Shaman creature until end of turn. It's still a land.