Yue, the Moon Spirit might look like she has a steep Waterbend cost for casting a spell for free from your hand, but you need to consider that in the decks that want this, youre going to end up with dozens of artifact tokens like Clues, Food or Treasure, and/or Thopters, and its gonna end up decidedly easy to pull off
While they dont do anything right away, when one of the infected creatures dies, you get a copy that also gains the Tyranid type
Beginner players might yearn for a more approachable deck, or one that teaches them more important rules and mechanics for play
If a vehicle deck that touches blue comes about, this probably just goes in
Just keep it protected from invading forces with a card sleeve
The 0-loyalty ability can be a finisher if youve already got a wide enough board, which is why I see this Ajani as more of a support piece, personally