They may exhibit major edgewear, bends, creases, indents, scuffing, tears etc
While you cant memorise every card, learning the phases of MTG is one of the best ways to improve your skill as a player, helping you to properly plan your turns and know the exact time to drop an instant spell on your opponent to give you the biggest advantage
The amount of damage depends on the number of creatures attacking (which should be a lot)
Colorless decks can certainly be made to work, but there is no doubt you are dramatically curtailing your options for both card and effect selection
A bonus sheet is a collection of reprinted cards, often picked around a central theme or card type, that are included in packs, often with a unique art style as well
Youll automatically have a good Modern deck if you build decks like these, letting you save money with a deck that can be used across multiple formats