Monte Carlo simulation of Faeria damage pings

function calculatePings(pings, targets) {
  var success = 0;
  var failure = 0;

  next: for (var i = 0; i < 70000000; ++i) {
    var a = targets.map(function (x, i) {
      return {
        health: x.health,
        index: i
      };
    });

    for (var j = 0; j < pings; ++j) {
      var index = Math.floor(Math.random() * (a.length + 1));

      var card = a[index];

      if (index !== a.length) {
        --card.health;

        if (card.health === 0) {
          a.splice(index, 1);
        }
      }
    }

    for (var j = 0; j < a.length; ++j) {
      var card = a[j];

      if (card.health > targets[card.index].max) {
        ++failure;
        continue next;
      }
    }

    ++success;
  }

  return (success / (success + failure)) * 100;
}

console.log(calculatePings(4, [{ max: 8, health: 10 }]));