With them we can draw more cards per turn (by default, it is one at the beginning of each turn), switch between active and benched Pokemon, heal our creatures' HP, and so on
Hell, it could even be a red creature that prevents damage prevention and allows you to attack as if un-Goaded
Just organizing them by color will be appreciated by 95% of players
Naturally, all these naming conventions lend themselves to deckbuilding synergies nicely
Sacrifice after III.) I, II Search your library for a legendary creature card, reveal it, put it into your hand, then shuffle
It uses loads of self-mill to put multi-typed cards in the graveyard, after which you can use your reanimation effects to bring back your game-enders