One of them is being able to turn a planeswalker which happens to be a creature, like Gideon, Champion of Justice, into a Vehicle that is no longer a planeswalkermeaning that it cant be attacked to take off loyalty counters, but it still has its activated abilities
[Main] Until the end of your opponent's turn, give all of their Digimon "[End of Your Turn] Delete 1 of your Digimon." Lower Text [Security] Delete 1 of your opponent's unsuspended Digimon
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Some would argue that this leaves MRL some room for growth, while others posit that MRL simply lacks the popularity of sets like MRD
Compared to the current standard meta of Guilds of Ravnica, those were weak for competitive play