Invasion of Karsus // Refraction Elemental (#146)

[
  {
    "name": "Invasion of Karsus",
    "type": "front",
    "rules": [
      "(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)",
      "When this Siege enters, it deals 3 damage to each creature and each planeswalker."
    ],
    "types": [
      "Battle"
    ],
    "colors": [
      "R"
    ],
    "subtypes": [
      "Siege"
    ],
    "mana_cost": "{2}{R}{R}",
    "mana_value": 4,
    "supertypes": [],
    "color_identity": [
      "R"
    ]
  },
  {
    "name": "Refraction Elemental",
    "type": "back",
    "power": "4",
    "rules": [
      "Ward—Pay 2 life.",
      "Whenever you cast a spell, this creature deals 2 damage to each opponent."
    ],
    "types": [
      "Creature"
    ],
    "colors": [
      "R"
    ],
    "subtypes": [
      "Elemental"
    ],
    "toughness": "4",
    "mana_value": 0,
    "supertypes": [],
    "flavor_text": "The crystal landslide stirred over the shattered forms of the Machine Legion vanguard, and then it rose and rearranged itself into an avenging colossus.",
    "color_identity": [
      "R"
    ],
    "color_indicator": [
      "R"
    ]
  }
]