Clues and Treasures are generally meant to be used for their own abilities (drawing a card or generating mana) rather than Food and Blood (which could be spent by many cards in lieu of generating food or rummaging)
Heading down to my local TCG shop and playing it using Wizards Of The Coasts Final Fantasy specific Commander party rules then elevated the whole experience
You may reveal it if it's a land card
The set contains 119 cards including 6 Leader, 45 Common, 30 Uncommon, 26 Rare, 10 Super Rare, 2 Secret Rare
Of course, creatures are just an exampleyou can build your deck in the same way but with instants, sorceries, enchantments, or whatever card type your desire, as long as you have enough cyclers
And a beautiful addition to the already stellar Slow catalogue