One of the best known chants for raising power is the Witches' Rune. When we dance the Witches' Rune as a dance of power, we evoke the magickal energies of the Witches tools.
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The Witches' Rune

Darksome night and shining moon,
East then South then West then North.
Hearken to the Witches' Rune.
Here we come to call thee forth.

Earth and Water, Air and Fire,
Wand and pentacle and sword,
Work ye unto our desire,
and hearken ye unto out word.

Cords and censor, scourge and knife.
Powers of the Witches' blade,
Waken all ye unto life,
And come ye as the charm is made.

Queen of heaven, Queen of hell,
Horned hunter of the night,
Lend your power unto our spell,
And work our will by magic rite.

By all the powers of land and sea,
By all the might of moon and sun,
As we do will so mote it be,
Chant the spell and be it done.

Eko, eko Azarak !
Eko. eko Zamilak !
Eko, eko Cernunnos !
Eko, eko Aradia !

From the book "Wicca" by Vivianne Crowley