Vraska, the Silencer and Chevill, Bane of Monsters generate incremental value when creatures die depending on the scenario
Is Darkwing an enchanted
(You may cast this card from your graveyard for its escape cost.) Escape, Exile five other cards from your graveyard
The second big flaw I find in Spell Snare is that it serves very little specific purpose in the cube, you never play it really to deal with something generic as you might with a Disenchant or Negate effect
Unfortunately, if you were hoping to be the lucky one, youve missed your chance
While its symmetrical effect is typically seen as a downside compared to Doubling Season, you should instead use its presence on the field to your political advantage: Dont remove me from the game, youre getting value off of my Primal Vigor, Wait, I can cast Primal Vigor next turn and we can swing in with all those Tempt with Vengeance tokens, etc