20 billion
Nether Shadow is a ghostly, sentient shadow-creature (later retconned to a 'Spirit') with relatively more stylized artwork -- a simple cloak body, and a very simplified jack-o-lantern skull, but that makes the detailing of the quasi-reflection of anatomically accurate bone structure work so much better here
Jolteon can be combined well with Zapdos EX, which has a similar mechanic, and together, they can deal as much as 360 points of damage
The only one that really jumped out at me is Protean Thaumaturge, since its cheap to cast and being able to copy the best creature on the battlefield is going to be huge sometimes
Similarly, I quite like cards like Death Kiss that incentivize opponents for playing the game your way, but dont fully force them to do so
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