Idunn is the Norse goddess of Spring, and keeper of magic apples that the Gods consumed for their immortality
This card is a reference to the Sabacc game where Han Solo won the Millenium Falcon from Lando, and I think it does a good job capturing the spirit of a high stakes card game
Sometimes, cards with instant speed that contain graveyard recursion can even be used as protection by bringing back your whole board from a board wipe turning it into a one-sided board wipe
It gives non-blue colors the ability to dig past dead draws and use mana efficiently at instant speed both massive advantages
Maybe its Animate Wall, the card that got you into Magic
Whenever a creature receives damage, it sticks around on the creature until the end of the turn, so it's possible to slowly kill a creature by dealing damage several times during a turn