Obsidian Delta enters the battlefield tapped unless you reveal a planeswalker card from your hand.

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

: Add  to your mana pool. Activate this ability only if you control an Island.

: Obsidian Delta becomes a 2/2 blue Shapeshifter creature until end of turn. It's still a land.