On top of that, when you sacrifice it, you get tempted by the ring, making it an auto addition to decks that care about the mechanic, or just to at least make something harder to block
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I run it in my Chainer Reanimator deck, and I use it as a finisher
(Ironically, I bring this up during one of the most linear sets [ Scars of Mirrodin ] that we've done in quite some time.) When you use a threshold mechanic, it usually means you want to start looking for a modular mechanic to help keep the balance
Casting a planeswalker as a spell uses the stack
A white-blue-black that costs four total mana, hes a 3/3 with incredible abilities for being that mana-cheap, including First Strike, vigilance, AND menace