Rad makes for a new damaging Counter variant to synergize with proliferate, without being quite as oppressive as Poison
As for Armored Ascension, its not the first of its kind to reward mono-color decks, but I wanted to highlight it here as part of this focus on color-based restrictions
during the End Phase of this turn, add 1 "Gravekeeper's" monster or 1 "Necrovalley" card from your Deck to your hand
This creature not being a legendary is such a shame
There are three main types of card in Disney Lorcana: characters, items and actions
As far as playability, Mystic Confluence only really sees play in Commander, although it's a true staple in the format, coming in at among the top 50 blue cards in the format according to EDHREC