Mayuri Shiina

Vanishing 3 (This permanent comes into play with
three time counters on it. At the beginning of your
upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
At the beginning of each upkeep, if Mayuri Shiina
is the best waifu, you may put a time counter on
it. Then if Mayuri Shiina has five or more time
counter on it, sacrifice it. If you do, take an extra
turn after this one.
Remove a time counter from Mayuri Shiina:
Mayuri Shiina becomes the best waifu.