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

Set: International Collectors' Edition Type: Instant Rarity: Rare Cost: {G} Look at the top three cards of target player's library

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

Shatterskull Pass is a pretty distant second

return an instant or sorcery card at random from your graveyard to your hand

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.