Undyne the Undying

Vigilance
Undyne the Undying costs {1} less to cast for each creature card in your graveyard.
If Undyne the Undying would die, instead,
put a determination counter on it.
When Undyne the Undying has 3 or more determination counters on it, exile it.
"For the sake of the entire world, I, Undyne, will strike you down!"