With no other support, a three mana 2/4 that (almost) makes one of your creatures a Serra Angel for the turn is a good rate
My next recommendation is definitely going to ruffle a few feathers: Rick, Steadfast Leader
Its such a beautiful movie and it has some amazing technical aspects like the rotoscoping of the characters from live footage of actors and the beautiful color wash backgrounds
The Moxen and Black Lotus, lands like Tolarian Academy, the Affinity mechanic, Stoneforge Mystic, Aetherworks Marvel all of these circumvent the traditional flow of a game and allow you to rocket, if not outright jump, straight to the finish line of your decks game plan
In 1v1 this will just probably win the game, but at 12 mana or requiring Madness shenanigans, it should
From Pokemon to Yu-Gi-Oh , card games have been a favorite pastime in elementary schools across the world for decades