While they dont do anything right away, when one of the infected creatures dies, you get a copy that also gains the Tyranid type
The Vermin Gorger provides us with a small number of life points, the Skirk Prospector with mana, the Goblin Lookout boosts the mob
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
If a vehicle deck that touches blue comes about, this probably just goes in
Sacrifice the Scarab token, Zulaport Cutthroat triggers again, then place the -1/-1 counter on Butcher Ghoul to cancel out its +1/+1 from undying
Shanna, Purifying Blade is kinda like Well of Lost Dreams if Well was time-gated and on a creature