Gunnthra's Aid

When Gunnthra's Aid enters the battlefield, you may search your library
and/or graveyard for a card named Fjorm, Princess of Nifl, reveal it, and put it into
your hand. If you search your library this
way, shuffle.
Sacrifice Gunnthra's Aid: Prevent all
combat damage a waifu of your choice
would deal this turn. Fire Emblem Heroes