Cavalier of Night [Core Set 2020] Island Mountain and who was ultimately responsible

and who was ultimately responsible for what it became over time

Set: Unlimited Edition Type: Creature — Human Knight Rarity: Rare Cost: {2}{W}{W} {W}{W}

Set: Revised Edition Type: Sorcery Rarity: Rare Cost: {3}{W} Destroy all lands

You may reveal up to two creature cards from among them and put them into your hand

Set: Arabian Nights Type: Creature — Djinn Rarity: Rare Cost: {2}{U}{U} Flying

Cavalier of Night [Core Set 2020] Island Mountain and who was ultimately responsibleSet: Core Set 2020 Type: Creature Elemental Knight Rarity: Mythic Cost: {2}{B}{B}{B} Lifelink When Cavalier of Night enters the battlefield, you may sacrifice another creature. When you do, destroy target creature an opponent controls. When Cavalier of Night dies, return target creature card with mana value 3 or less from your graveyard to the battlefield.