You, Iterative Playtester [Unknown Event]

{T}: Choose another target playtest card. Increase or decrease a number of your choice on it by 1 for as long as it remains on the stack or battlefield. (You can change numerals or number words.)
{W}{U}{B}{R}{G}: Reveal the top eight cards of your library. Put each playtest card among them into your hand. Put the rest on the bottom of your library in a random order.