Something that does work is my final suggestion, Kami of Whispered Hope
If you don't have any appreciation for this card, my guess is you're just not a Melvin
This artifact has a fun story attached to it, too: Originally, Skullclamp was designed to give a +1/+1 buff, but before seeing print the Magic designers thought that such a buff would make Skullclamp too powerful and they changed it to +1/-1
For my first colorless deck, I built a $32.25 (sorta, I split up and gave that price to both lands and non-lands) Voltron deck around Traxos which you can find here - Budget Commander #69 - Colorless Voltron with Traxos
The turtle basically lets you and your other creatures tank 20 points worth of damage, which makes this something of a second life total that your opponent has to slog through
3 Reflecting Pool The Lands Empower The Lands Reflecting Pool will have you reflecting on which other lands you include alongside it, as it requires other lands to take advantage of its potential