Elf-themed decks are particularly good at pulling this off, with the impressive amount of mana these decks can generate
(Also, Sol Ring is a 1-drop, and most ramp really starts on turn two, so I think it's better to think in terms of what we can reliably get, rather than luckily starting with one of 99 cards.) So, let's say I'm building around a 5-drop Commander who really needs to be on the 'field before I can start doing my thing
For example, the rulebreaker mechanic on Arvad of the Weatherlight says that you may include legendary permanents of any color in your deck regardless of color identity
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YouTuber Brian Lewis recently published a video extolling the virtues of Time Spiral Remastered for its benefit to the MTG community
For example, if a players Jace, The Mind Sculptor card gets accidentally damaged, the judge can provide a proxy to be used in its place