For instance, Mother Bear, a 2/2 for two from Modern Horizons , is a vanilla Grizzly on the battlefield, but when its in the graveyard, you can pay to create two 2/2 Bear tokens
Instead, include a few powerful ones that work well with incidental graveyard growth and enjoy the extra value, as, in general, chasing threshold wont be worth the effort
Also, since the overall power level of Modern is dramatically lower compared to Legacy and Vintage, the 2 for 1 for countering a medium-power non creature spell is often not worth it
(Then again, they might have other filler cards, like those DECK 04 / DECK 06 that came from Brazilian Portuguese decks