If I had to pick a favorite base card today, it would actually be shadowless Caterpie, hah
Draw two discard two is a good chunk of immediate action as well as card quality
A variety of creature-toolbox decks rely on Chord of Calling as an instant-speed tutor to find silver bullet answers like Reclamation Sage and Collector Ouphe to hamper their opponents, or to assemble value engines with cards like Yawgmoth, Thran Physician
Eldritch Horror : Every spell has a consistent effect that you will always get if you cast the spell correctly, but also has a range of potential side-effects, and which side-effects you get is doubly random, depending both on which specific spell card you have and how well you cast the spell
You can do this with fetchlands , Strip Mine , and a whole host of other cards if you want to get up to three uses out of them - perhaps you can even bait your opponent into a board wipe while you also have these permanents on board to get even more value