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During your opponents next turn, prevent all effects of attacks from your opponents Pokmon done to this Pokmon (damage is not an effect)

Now, Temur Energy isnt the be-all, end-all deck I may be making it out to look like

Yes, you can cheat it out with Scrooge McDuck - Richest Duck in the World but that is yet even more setup required for this combo

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It can also cast itself at instant speed, it flies where Shimmer MyrShimmer Myr walks, it lets you cast colorless spells in addition to artifacts, and it pumps itself with every spell, making the fact that it starts with one less power pretty dang moot

You actively want your creatures to die so you can keep these triggers going, so blocking with weak creatures turns into major burn damage