Pohjola, Northern Paradise

As Pohjola, Northern Paradise enters the battlefield, sacrifice it unless you tap three untapped creatures you control.
Indestructible
{t}: Add two mana of any one color.
When, when will I see again
the new might of the winter land
The charm of snowy grounds
black forests and grim trees
The dim burn of the northern light
in Pohjanmaa a familiar sight
Is not all where it should be?
Surely the folk living there
are still as strong as they once were?
When will I see the north?