If a triggered ability causes the planar controller to planeswalk away from Lake Silencio, its ability no longer gives spells split second and players can respond to spells and abilities as normal
Its a good fit in lifegain/life drain decks, zombie typal decks, or even Bloomburrow -inspired bat decks that care about gaining and losing life
Seeing that you'll be casting increasingly mammoth hydras, you'll nearly always be the only player to benefit from this ability, letting each hydra you cast replace itself in your hand
Heliod, Sun-Crowned Heliod, Sun-Crowned is the perfect addition to lifegain decks
This deck was just so special, knew how to win and how to maximize its edges, that it gave Buehler the room to out-play some opponents and bowl others completely over