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By Your Side ( Kimi no Soba de ) : finish every storyline for each Tier 1 and Tier 2 character

If you have a lot of relevant permanents such that their Detention Spheres always have targets but yours might rarely have non Detention Sphere targets, you might need Banishing Light so that you can remove their Detention Spheres with a card that would otherwise be dead, having no other target than Detention Sphere

That's an easy one, it's Mega Evolution: Phantasmal Flames

I also like its versatility, allowing you to steal a cheaper creature early on if need be

Performage Plushfire, one of their more impactful cards, was then banned and later nerfed by an errata

Play this on turn one, and on the following turn, play another 1-drop and pay the extort cost