You, Iterative Playtester

Legendary Creature — Human Gamer - (mythic)

: 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.)
: 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.