For example, if a decks highest cost card is 7, players may want to make sure there are at least some cards in each of the costs from 1-6
Wizards clearly saw what a good way this was to get extra cards into the MTG Historic format, so in 2021 they released Jumpstart Historic Horizons, a new batch of Jumpstart cards that could only be accessed on arena
Here are my Top 20 Modern Horizons 2 cards for Commander
If trading individual cards, trade-in for cards that can go in multiple decks : This is similar to the reason for rare and mythic dual lands
Just one little creature can give major boosts to every other Sliver in play, multiplying your army many times over with just a could of creatures
That's pretty incredible when you consider that this ink combination, Ruby/Sapphire, was arguably the strongest archetype throughout the entire Into the Inklands season