Last hope of the Underground

Put two hope counters on target creature, that creature gains undying X until end of turn.
"No... My body... It feels like it's splitting apart.
Like any instant... I'll scatter into a million pieces.
Butt... Deep, deep in my soul. There's
a burning feeling i can't describe. A burning feel that...
WON'T let me die!"
—Undyne, the Undying