Encore to get more enter and leaves effects, plus damage triggers and the like
Id say you want at least 3-5 protection effects, but that depends on what your deck needs
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That's a very good question
49/82 Abra
To be clear, this is a sorcery speed effect, but you have priority as soon as it resolves, and sacrificing a creature is a cost to activate the ability, so there's not much of a window for people to remove it before you can use it