The Evirs must be killed quickly before they descend too far. It can help to fire at the Evirs from a safe distance so they will not be triggered to attack Samus.

Requires:

"canPlayInSand"
{
  "or": [
    "canFarmWhileShooting",
    {
      "and": [
        "Plasma",
        "Wave"
      ]
    }
  ]
}
{
  "or": [
    {
      "resetRoom": {
        "nodes": [
          2
        ]
      }
    },
    {
      "and": [
        {
          "resetRoom": {
            "nodes": [
              1
            ]
          }
        },
        "Gravity",
        {
          "cycleFrames": 300
        }
      ]
    }
  ]
}
{
  "or": [
    "Gravity",
    {
      "and": [
        "canSuitlessMaridia",
        "HiJump",
        {
          "cycleFrames": 100
        }
      ]
    }
  ]
}
{
  "or": [
    {
      "and": [
        "Plasma",
        {
          "cycleFrames": 880
        }
      ]
    },
    {
      "and": [
        "ScrewAttack",
        {
          "cycleFrames": 880
        }
      ]
    },
    {
      "and": [
        "Wave",
        {
          "disableEquipment": "Ice"
        },
        {
          "cycleFrames": 1200
        }
      ]
    }
  ]
}

Farm cycle drops: 3 Evir

Dev note: FIXME: Slower methods are possible for resetting at the left door.