Emerge doesnt change the speed in which you can cast the spell, so it depends on the emerge spell itself
Sometimes you have to win the fair way with an unfair deck, so draft tools to successfully cast spells that you were hoping to cheat onto the battlefield with unfair cards
Last but not least, not only because of the fantastic illustration which makes me laugh every time, the Siege-Gang Commander has to be mentioned
For three mana, you get to search for an instant or sorcery that costs two or fewer mana
For the most part, the left side of the dungeon is going to be the most important one to progress through as it represents the most aggressive path of the dungeon and the one that generally is going to kill opponent's the quickest
7 Nashi, Moon Sage's Scion Trade Life For Spells Nashi is both a great Rat and commander, letting you cast the top card of someone's library whenever it deals combat damage