Even printing MTG look-a-like cards just for personal use is skirting the line
You want to ramp as fast as possible using Elvish Mystic or Rampant Growth to turbo out massive threats like Ulamogs Crusher
They're an absolute blast to shuffle and can be effectively used for any situation constructed decks, Cube, Commander, you name it
With its next appearance in the Shadows over Innistrad block in 2016, the mechanic saw a big change in how it worked
Angrath, Minotaur Pirate is worth protecting so that it can reanimate pirates as much as possible
For years, Lightning Bolt was so powerful that decks like Jund and Jeskai Control were essentially splashing red just for it, but now the cards in the format are so powerful that decks that play red and want that effect dont even necessarily want the full four-copies