Living Lava

(Living Lava isn't a spell, and it has "{t}: Add {r} to your mana pool.")
Haste
{r}, Sacrifice Living Lava: Draw a card, and if you do, discard a card.
He who controls the center of the plane controls the lands. The life of the magma inside its core is evermore chaotic as it unleashes its wrath when its demands are not met.