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
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
Another possible result of the roll is the Planeswalker symbol, in which case the player who rolled the die puts the active plane on the bottom of its owner's or the shared planar deck and reveals the first card of their own planar deck or the next plane card from the shared deck
The amount of damage depends on the number of creatures attacking (which should be a lot)