Complexity runs from approachable (Naya) to deck-building delights (Esper), so both newbies and grizzled planeswalkers will find their sweet spot
For example, if the returning creature is a Clone, it cant enter the battlefield as a copy of Colossal Whale
Four mana to destroy any creature is already fine, but convoking your creatures to cast Vote Out lets you fit it into a lot more places on your curve
But if you do get it to happen, Ragnarok should win you the game by itself, so its worth trying
You gain bonuses from putting cards into your graveyard if you descend, and then you can use those cards to collect evidence further gaining optional abilities or effects
We dont want to just talk about Standard though, as wonderful as it can be