There are many other types of rarities introduced throughout the series, such as Rare Prime, Rare Holo LV, EX etc that are similar in terms of distribution within a set
Youll complement your game plan with black removal, allowing creatures to attack freely, and blue bounce spells and counterspells to protect your plans
It isn't once per turn and it doesn't have any restrictions
Giving cards away can be dangerous over time, but Ms
Creating Spirit-clones of other creature cards opens up powerful interactions with your tribal buffs, as well as more opportunities for straightforward value from ETB triggers and the like
Always wash your hands before touching them to avoid transferring oils or dirt, and consider using card sleeves or top loaders for added protection