Since Ezuri comes with a mana value of three, its easy to cast the card from the command zone with Llanowar Elves or Elvish Mystic on turn one, giving you access to an Overrun-style effect in the late-game
Archangel Avacyn does a fine job protecting your team from a Kozileks Return, and Verdurous Gearhulk can get a creature or two out of range of the Kozileks Return
Some decks can get away with one, two, or three, but mostly you see it in fours
It's important to note that, if the player targets Kaya using this ability, she will return to the battlefield with her original starting loyalty as per rules 306.5b and 614.1c
Cards that receive high grades, such as 9 or 10, are typically worth more
Buy an air filter to remove dust from the air, create a clean working space, use a non-abrasive foam mat to lay your cards on, use rubber gloves, and have a quick storage plan in case something comes up or you need to take a break