Gazavoth the Dual Faced

Deathtouch, Trample
Whenever you tap a land for mana, you may pay
1 life, if you do, add {b}{g} to your manapool.
{1}{b}{g}: Gazavoth the Dual Faced gets +1/+3
and Double Strike until end of turn.
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From one mouth flows the light of the worlds nature
and vitality, from the other flows its death and encumbering pain.