These need to be smaller and tighter in order to fit inside outer sleeves, and this is reflected in their sizes
First, you draw 2 cards, but each card you draw can be a dredge activation instead
(2021-09-24) To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions
There are also two evolutions of Eevee in Obsidian Flames and a fair number of good cards beyond the four Charizard chase cards that most players will be looking for
The second, and perhaps most important, is that most cheap removal spells are almost universally one color, meaning that dispatching Zenith Chronicler with something like Cut Down or Voltage Surge won't be difficult at all
Look at the sheer amount of cartoony viscera and organs