Druïn, Monument of Kaldheim

You must spend at least 3 or more different
colors of mana to cast this spell.
Wheneaver you tap a land that could produce 2
or more colors, add one mana of each color it
could produce.
Creatures you control get +1/+1 for each color
it is.
Whenever you cast another spell you gain 1 life
for each of its colors.