Magic has always had a fair share of 1-mana 1/1s and 2-mana 2/2s, but power and toughness dont always scale 1:1 with mana value
Calling something a Splinter Twin situation has basically become shorthand for a simple 2-card combo thats starting to take over a format
If you do, it gains "When this permanent is put into a graveyard from the battlefield, exile it and you gain 2 life." Once during each of your turns, you may play a land from your graveyard or cast a permanent spell with mana value 3 or less from your graveyard
One of the reasons for its popularity is that the value of certain cards can fluctuate greatly
This is especially effective against token decks since a lot of tokens like elves, soldiers, and squirrels start at 1/1
Shahrazad is on the Reserved List, but if it were to receive a reprint, the new version of the card would simply state, "Players play a Magic subgame, using their libraries as their decks