Destroy target artifact or enchantment. Its controller gains 4 life.
"On this plane, the use of magic can provoke a ferocious reprisal from nature. Whoever the Eldrazi were, their relics left Zendikar forever enraged."
—Jace Beleren
If the target artifact or enchantment is an illegal target by the time Nature's Claim tries to resolve, the spell doesn't resolve. No player gains 4 life. If the target is legal but not destroyed (most likely because it has indestructible), its controller does gain 4 life.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.