Open Play is highly encouraged for any TCG or tabletop game
With Fauna Shaman in your deck, you can also take more of a toolbox approach to deck building, with one or two copies of specific cards to help in any situation
Aragorn and Arwen, Wed is a mythic, Legendary Creature - Human Elf Noble card from the Magic The Gathering set The Lord of the Rings - Tales of Middle-Earth (MTGSC-LTR-0394)
And, of course, you can imagine how evil this is with Kiki-Jiki, Mirror Breaker, or Freed from the Real and any permanent that taps for blue and at least one extra mana
Lets take a look at the cards and features that have currently been revealed for Universes Beyond: Assassins Creed
You have to rely a lot on drawing Kodama of the East Tree or another enabler and you don't have quite as much redundancy as you'd have in a deck with maybe a half dozen Walking Atlases and you can't use Murasa Rootgrazer basically at all, which is a shame, but you can still generate a ton of value in ways Blue decks can't