Dragonstone

Dragonstone enters the battlefield tapped.

{t}: Add {c}. If you control a creature or
planeswalker commander, you may add {r} instead.

{1}{r}, {t}, Discard a card: Draw a card. You may
reveal that card as you draw it. When a Dragon
card is revealed this way, Dragonstone deals 2
damage to any target. Activate only if you control a
creature or planeswalker commander.