The effect stops Raya, Leader of Heart from receiving any damage when she challenges a damaged character - making the card a great way to pick off cards left smarting by your other challenges or card effects
Additionally, it wants us to cast multiple spells in a turn in order to draw more cards and gain more value, so the creatures of the type need to be relatively low-cost and the deck needs a solid volume of hits, so the type needs to have a lot of low-costing members
He maintains the Menace ability, and grows to become a 7/7
Undo (Mirage/Visions/Weatherlight) Each block has a different threshold of development
It bears the exact same characteristics and abilities, and even assumes the identity of both an artifact and an enchantment, giving the player a surprising amount of adaptability to the changing battlefield
The deck focuses on casting aggressive knight cards, and generating value through adventure effects, graveyard interaction, and card draw