Lonely Walker

Shroud, unblockable
Whenever this creature deals combat damage to a player, put 5 +1/+1 counters on it.
"The baby elephant was taken from it's family and had many tests performed on it by Kaladesh artificers. They changed it so much, it had more gears than you can count. The elephant grew to be so powerful, it destroyed the factory and ran away. Never to be seen again..."