Lynaru-Hydor, Hyperlite Soul

Mountainwalk (This creature can't be blocked as
long as the defending player controls a mountain.)
When a land that is not the colors of this creature enters play, exile that land and all land on the battlefield that has the same name as that land.
Your opponent may discard a card and pay 3 life,
if they do, this ability is countered in that way.
{u}{u}, sacrifice a creature you control:
destroy target non-basic land.