Elfhame Highlands
Land (Rare)

When Elfhame Highlands enters the battlefield, sacrifice it unless you pay R.

Tap: Add R or G to your mana pool.

Sacrifice Elfhame Highlands: Add R or G to your mana pool.

1R: Elfhame Highlands becomes a 1/1 red and green Bear creature with first strike until end of turn. It's still a land.

Allan Staples