An Encyclopedia of Magic is out now, available only on MagicSecretLair.com
This is different from simply asking how fast does your deck draw cards, since you dont necessarily need to draw all the cards in between your top card and the target card
Portent looks at the cards now but draws a card on the next turn, which leads to a lot of spicy Terminus flips on your opponents upkeep
You have to see one of these in person to really appreciate how good it looks
You choose which opponent, planeswalker, or battle the token is attacking as it enters
In parallel, there is another layer of demand driven by factors outside of gameplay: cards sought after for collecting , for being illustrated by a particular artist, for being a misprint , or for being part of a cycle