Casual Reprints Casual / Commander reprints often fare better than tournament-focused reprints when it comes to reprintings in Commander decks
Not to mention, if you're looking at an older core set card from before Sixth Edition , there may not even be an expansion symbol at all
Masters sets always have some oddball color combinations that either lack a particularly coherent archetype (RG in MMA2013), have a low average ceiling (UR Elementals in MMA2015, BG Dredge in MMA2013) or are so flexible as to not really have have an archetype (WB in EMA)
Level up does nothing to effect the random nature of drawing lands but it greatly dampens the severity of the extremes
Many subsequent assassins have been variants on one of these two designs for creature-based removal
Excepting some very unusual cases, that copy won't be a land, so it won't also become an Island