MTG Salvation

I'm going to be introducing someone to the game, and rather than use precons or make decks with vanilla creatures, I want to use cards that actually do stuff... But not overly powerful ones. What are some neat low powered interactions that have a skill ceiling and might encourage learning and allow for fun, slower pace interactive games?

I'd suggest looking at pauper play lists, lots of cool fun interactions and it's relatively cheap if they want to build their own.