In my playtesting with this deck, my wife (who piloted the deck) drew so

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You are less focused on delve so you need less looting effects to power it
Yes, cost reductions work on evoke since it calls out reducing the casting cost
A regular planeswalker with these abilities (+1: add a counter to a critter, -5: Draw two, -10: Add ten mana) would be pretty middling for what Commander decks what to do
If you are able to go wide on your board and flood it with toughness 1 creatures, then you can pretty much just pay 1 mana to draw 2 cards as much as you like