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While I would say that the effect isn't unfair, it can certainly swing a game in the favor of the caster very quickly

Then of course there are the simplest ones that simply draw two or more cards which was what my last list focused on

4 Rainbow Energy Team Rocket $28.84 A Universal Energy Card Rainbow Energy was first released in the Team Rocket expansion of the Pokemon TCG

The red Leylines are all about burning your opponent, so make sure to include cards like Boros Charm, Monastery Swiftspear, and Searing Blaze

Be free to break those rules and differentiate as you see fit, as many times special builds/decks require quite different approach and it heavily depends on your preferred playstyle, the chosen commander and the mechanics in use, among other things as well