Yes, you need a deck that can reliably provide evasive creatures to enchant, and that creature is probably going to die within the next 3 turns or so, and by enchanting it you're adding extra incentive for your opponents to kill it, but all those risks are worth the payoff of drawing more than 1 card for just 1 mana
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Proliferate decks can get value from this by proliferating the charge counter, effectively turning this into a 1-cost mana rock with little additional effort
Elspeth, Sun's Champion Elspeth, Sun's Champion has two main functions: The first is to generate a massive number of soldiers each turn which can block well and end the game
Though the cards she returns to your hand are random, it's never bad to get extra cards regardless
You will need at least one other Zombie in play to be able to cast Gravecrawler from the graveyard, but once you get going, you can keep sacrificing your spare Zombie token to keep looping death triggers for whatever outlet you need