The context of the activation costs does matter, actually! This is a hard one to answer though, since the tokens aren't three mana apart in value, and Cylix of Creation costs 2 mana up front itself... Pfff... rough. My gut says
Blood >
Treasure >
Food >
Clue, and here's why. While filtering cards is powerful, the Blood token is the only one that doesn't increase a player's resources in any way. Sure, it makes your hand better, but at least it costs 1 mana to activate on the token itself, so basically the Cylix is a colorless
Merfolk Looter. That's pushed, but I think making any of the other options the free activation is more disruptive. If you put the Food token at
, you're still gaining life equal to the mana spent. I think that might not be an option you want so freely to give to blue and red decks, which is why I put the Treasure at
. It's basically mana parity, but if you could start hoarding tokens starting from turn 1, that would still be very dangerous. Luckily, the up front cost of Cylix means the first time it acts as a 3 mv mana rock, which is perfectly fine. In the late game, building Treasure tokens is relatively useless as well, which is another reason to not make this ability more expensive. I put Food token at
because it's less valuable than straight up drawing cards, so the Clue token gets to sit at
.
for your first card isn't great, but compared to
Jayemday Tome it feels right (considering that the Cylix offers more options and spreads the payment).