Ral Zarek Before even touching the coin flip aspect of this card, Ral Zarek can be a pretty powerful planeswalker
Lonis, Cryptozoologist is one of the better choices for this deck since it gives you a free sacrifice outlet for your Clues
Academy Manufactor Tripling up on Clue, Food, and Treasure tokens is going to be bonkers
Rhystic Study [Best Early Game Blue Enchantment] Rhystic Study is a very common card in the best Commander decks, and heck, any deck that can run Blue
This one had a little more value than the others, though, and has some strong historic pedigree backing it, so it ranks a little higher
Turning lands into creatures is really powerful, and in a deck full of proliferate, those lands can become even stronger creatures later in a game