Since Pokmon cards are sold based on their condition, you'll need to keep the cards organized and safe, away from potential threats
Cats most often appear in green and white
If your untap step is somehow skipped as your next turn begins, your phased-out permanents won't phase in until the next untap step you actually have, but you'll no longer have protection from everything and your life total can change again
These are great for enabling domain for Collective Restraint and Prismatic Geoscope while also just being great fixing by themselves
Sure, your Consecrated Sphinx is good to resolve, but before my turn, for the price of one blue mana and an expendable creature, let me get my own straight to the field with Mask of the Mimic as well
All you need to know is that at the beginning of your uptap step, any permanent that is phased out phases back in and vice versa