Key to the Portal

Key to the Portal enters the battlefield with X +1/+1 counters on it, where X is twice the number of creatures that died this turn.
If Key to the Portal has 8 or more +1/+1 counters on it, players have "If you would lose life, lose three times that much life instead."
Discard a card: Put a +1/+1 counter on Key to the Portal.