There's also the serialised Edgar Markov lottery: 500 serialised copies in Movie Poster art exist exclusively in Collector Boosters
Aetherworks Marvel | Illustration by James Paick You take any two Jumpstart booster packs, open them, and shuffle up and play as in, shuffle both decks together and play a game of Magic with your 40 card deck
Except perhaps for Ancestral Recall, Rhystic Study is simply the best card-draw effect you can include in your EDH deck, possibly the best enchantment in the Commander format, and among the strongest early plays
Because you can choose any mode multiple times, Mystic Confluence allows plenty of freedom with your choices
This mode makes it better than Nature's Rhythm at one less
It also means that if you can make it leave and reenter, you can refill your hand with whatever you want