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Echo essentially asks you to skip a turn, but Vanishing 3 gives you plenty of time to make use of a card, and it's an easy downside to work around too.

Clarabelle was a bit of a slow burner but now people are starting to see her value

Bloodflow Connoisseur Bone Splinters Butcher Ghoul Crypt Creeper Death Wind Driver of the Dead Essence Harvest Ghoulflesh Grave Exchange Hunted Ghoul Mental Agony Necrobite Polluted Dead Predator's Gambit Renegade Demon Searchlight Geist Soulcage Fiend Undead Executioner Unhallowed Pact

In lower power brackets, Kefka can work as a combo enabler for Waste Not, an enchantment that makes its user create a 2/2 zombie token every time an opponent discards a card, which can be every time that Kefka attacks or enters