(: Add or to your mana pool.)

When Spinerock Oasis enters the battlefield, you lose 1 life unless you reveal a planeswalker card from your hand.

, : Target land becomes a 2/2 red Ogre Goblin creature until end of turn. It's still a land.

, : Target land becomes a 3/3 green Leech creature until end of turn. It's still a land.