However, this is just speculation because there are lots of experts who say reprinting these cards would still not affect their prices all that much (at least for the original version from older sets, that is)
First and foremost, the most obvious effect it has is that it takes away your most dangerous card to their strategy with no chance at all for you to stop them
Illustrated by Vincent Proce Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
The rest remain in your sideboard
Over the years, Magic: The Gathering has had odd periods of trying something out, then tapering it off for a few expansions when they find out that the new thing isn't working or that players simply hate it
It never feels like an unstoppable avalanche, but it can come back from a board wipe after a turn or two