Doubling Cube

{3}, {T}: Double the amount of each type of unspent mana you have.

Candelabra of Tawnos

Aeve, Progenitor Ooze

Storm (When you cast this spell, copy it for each spell cast before it this turn. Copies become tokens.)
Aeve, Progenitor Ooze isn't legendary if it's a token.
Aeve enters with a +1/+1 counter on it for each other Ooze you control.

Deserted Temple

{T}: Add {C}.
{1}, {T}: Untap target land.

Gaea's Cradle

{T}: Add {G} for each creature you control.

Yavimaya, Cradle of Growth

Each land is a Forest in addition to its other land types.

Nykthos, Shrine to Nyx

{T}: Add {C}.
{2}, {T}: Choose a color. Add an amount of mana of that color equal to your devotion to that color. (Your devotion to a color is the number of mana symbols of that color in the mana costs of permanents you control.)

Early Harvest

Target player untaps all basic lands they control.

Crop Rotation

As an additional cost to cast this spell, sacrifice a land.
Search your library for a land card, put that card onto the battlefield, then shuffle.