Magic: The Gathering Thread XXV: 3 Vorthoses barely clinging to sanity and 45 Spikes

[Thomas Cardew]

What would be a good mana-cost and name for a black enchantment with "Whenever you gain 3 or more life at once, target opponent loses that much life and each other opponent loses 2 life"

Name : Zero Sum Game
Flavor Text: "It's not just about winning, it's about making sure everyone else loses."

No idea about cost/balance.