You certainly don't want to over do it, only the most appropriate cards should be going in and even so I think space is a bit of an issue
There is a sub-lifegain theme to the deck, with cards like Soul Warden and Guide of Souls both gaining life when creatures enter
At the moment, I think we have enough on-theme ways to draw cards, but if we're ever lacking in draw power, I would probably start with Remora
Another thing I can think of is Begone, Knave!
Yes, there are Pokmon trainer cards that have a holographic foil design
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