Planedeath Plague

Enchant creature, planeswalker, or player.
If an enchatned creature, planeswalker or player deals/receives damage to/from another creature, planeswalker, or player, create a token copy of Planedeath Plague enchanting that target.
At the beginning of each end step, put a -1/-1
counter on enchanted creature or deal 1 damage
to enchanted planeswalker or player.