Consuming Penumbra

Enchant creature
At the beginning of your upkeep, you lose 1 life. Put a copy of Consuming Penumbra onto the battlefield enchanting target creature.
When Consuming Penumbra becomes attached to a creature, tap that creature. If enchanted creature has 2 or more instances of Consuming Penumbra attached to it, it gets -3/-3. If it has 5 or more, its controller sacrifices it and you gain life equal to its toughness.