That is all 23 cards that have maximum hand size printed in their text boxes
The ability to also search any snow permanent makes it great for snow decks because it can go from being a ramp card to a tutor that finds something like Icebreaker Kraken
If this happens, not only does the chapter ability you landed on trigger, but any ones you passed along the way
But theres always a chance that it puts in more work than youd expect, especially against mono-colored decks with a low curve, or if you encounter it alongside Painter's Servant
Spend this mana only to cast an instant or sorcery spell or to gain a Class level." : Level 3 Whenever you cast an instant or sorcery spell, that spell deals damage to each opponent equal to the number of instant and sorcery spells you've cast this turn
For full details on the changes to come, check out the information page when it updates later this week