Dominaria United: Llanowar Loamspeaker
|Type:||Creature - Elf Druid|
: Add one mana of any color.
: Target land you control becomes a 3/3 Elemental creature with haste until end of turn. It's still a land. Activate only as a sorcery.
Mana dorks have evolved a bit since Llanowar Elves, haven't they? While not exactly filling the same role, this not only gives you an extra mana to work with, but it fixes your colors and has some extra utility.