I've always thought of making a rainbow deck (pwetty colours)
And so far I've bought the cards that I wanted to use as the mana base, but I don't know if it would work and I have yet to decide what spells to put into it. This topic gave me some ideas, especially skeindubh's post. I do consider adding, Mana Reflection, Bloom Tender, Prismatic Omen, and Legacy Weapon. I definitely know that BoP are a must.
What I have for a Mana Base is:
4 Spectral Searchligh
4 Darksteel Ingot
4 Vessel of Endless Rest
1 Chromatic Lantern
3 Star Compass
1 Gilded Lotus
2 Forests, Mountains, Islands, Plains and Swamps
1 of each Mirrodon Artifact Lands (Ancient Den, Seat of the Synod, Vault of Whispers, Great Furnace, Tree of Tales)
Worldwake Taplands; 1 Sejiri Steppe, 1 Bojuka Bog, 1 Smoldering Spires, and 1 Khalni Garden) I want Halimar Depths. I'm conflicted in deciding to use the ones from Worldwake (listed here, find them here too) or the common and rare ones from Zendikar, found here.
I've considered adding Lotus Vale, The Keyrunes from RTR and the Guildgates from RTR, but I don't know that would be a good idea.
My goal with this deck is a manabase that I can use to play anything I want to throw in the deck, in other words my dream "universial" deck that is able to switch in and out any cards tht are not in in the sideboard (editing it outside game) and it is still playable.