Whenever you gain life, put a +1/+1 counter on Essence Channeler
When your next untap step begins, Mutavault phases in and indirectly brings Godsend with it
Its color identity also helps, since you can return this creature itself via other means without that counter to do it again, or remove the counters with other cards in Black
Youre only safeguarding your next creature spell, not all spells you cast this turn, but sometimes that can be enough to meaningfully impact the board or close out the game
If Wicked Visitor leaves the battlefield while it has an Aura you control attached to it or at the same time as another creature with an Aura you control attached to it, its ability won't trigger for those enchantments unless they were destroyed by the same effect that caused Wicked Visitor to leave the battlefield
You could consider the behavior of committing crime as evergreen (can you imagine an MTG set with no cards that target your opponents or their things?), but the keyword action itself isnt evergreen