On the note of budget, each wildcard costs the same and is earned the same way in their given rarities, thus, if you spend a wildcard on a super expensive common or mythic, you can play with cards that would cost a fortune IRL
The two left cards are reprints, not expensive ones, but decent to play with
Spend this mana only to cast colorless Eldrazi spells or activate abilities of colorless Eldrazi
Gifts Ungiven on my mind as I type this
If that is you, however, then I would seriously consider the Brown over the more conventional Beast WhispererBeast Whisperer
Obviously, youll be playing this in an artifact deck to reduce its mana cost as much as possible