Cavalier of Night [The List] War of the Spark Tokens Set: International Collectors' Edition Type:

Set: International Collectors' Edition Type: Instant Rarity: Uncommon Cost: {2}{U} Psionic Blast deals 4 damage to any target and 2 damage to you

you don't lose this mana as steps and phases end

Conjured from the bowels of hell

Shatterskull Pass is a pretty distant second

Beauty is a seed

Cavalier of Night [The List] War of the Spark Tokens Set: International Collectors' Edition Type:Set: The List 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.