Volikar, the Fortress

Whenever a creature enters the battlefield under
your control, if you control a Mountain, you may
pay {r}. If you do, Volikar, the Fortress deals 2
damage to any target.
Whenever a creature enters the battlefield under
your control, if you control a Swamp, you may
pay {b}. If you do, each player sacrifices a creature.
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The Vulkanians do not dabble in petty politics.