In the case of Time Walk, it retained its devastating ability: take an extra turn for just two manaone of the strongest effects in the entire MTG game
If you somehow control Battle of Hoover Dam and no choice was made for it (perhaps because another permanent on the battlefield became a copy of it), it has neither of the two triggered abilities
Oath of Nissa breaks that pattern, offering the chance to dig for what you need to, even us honest folk with honest creatures
You can also substitute one or both copies of Dragon Tempest with Scourge of Valkas
If youve been a Pokmon trading card game fan/collector since the original days of the series, this news may peak your interest or at least inspire some nostalgia to surface within
Cards that would go to your graveyard still will, even while your graveyard is a creature on the battlefield