Yuno Gasai

When Mirai Nikki enters the battlefield
under your control, she becomes the Best Waifu (The best waifu gain +1/+1 as long as
she is the best waifu).
At the beginning of your endstep, if Mirai Nikki is the best waifu, you lose 3 life.
Yuki... Yuki! YUKI!!!