mtg draw 2 cards lose 2 life Deck All cards will be carefully packed for safe transit It's a new era :

I would also include Foundry Inspector as an honourable mention, though it just loses out due to costing 1 more mana

Creature - Bird Color tag templates(None) Guardian Gladewalker Changeling (This card is every creature type.) When this creature enters, put a +1/+1 counter on target creature

It wouldnt even need to be a tribal deck for Cavern of Souls to be valuable

Shiko, Paragon of the Way Shiko, Paragon of the Way lends itself to flicker strategies that use its enters ability to exile cards like Ghostly Flicker and Displace and generate crazy value loops

You might also consider running Horn of Gondor to increase your human creature count, or Karvanista, Loyal Lupari to spread out +1/+1 counters on attacks, or even Cloaked Cadet for some extra card draw