Swan Leak

Enchant Creature
Blessed - Enchanted Creature has: "Whenever
Swan Leak or another enchantment enters the battlefield , put a +1/+1 counter on each
enchanted creature you control and you gain
1 life."
Cursed - Enchanted Creature has: "Whenever
Swan Leak or another enchantment enters the battlefield , put a -1/-1 counter on each
enchanted creature you control and you lose
1 life."