Potion Seller

Every player may purchase from Potion seller
To buy a potion, sacrifise
one land of the desired potion color:
{w}: you gain 5 Lifepoints.
{u}: Draw 2 cards.
{b}: destroy target creature or Planeswalker.
{r}: deal 5 damage to target player or creature.
{g}: 3 mana of any color until the end of the turn.
My potions are too strong for you, traveler.