On a naked board, you can toss a +1/+1 counter on something
Youll usually have ample mana to work with too, so whats 1 more when casting a tutor, killing a creature, or putting one of your own out onto the battlefield
Craterhoof is the best Overrun effect by a mile
Most of the fixing in this set is tied to green or lands, so any rainbow builds should be base-green
Instead of directly stopping creatures from attacking you, it forces your opponents to make a tough choiceeither pay they 3 mana for each attacking creature, or they let you create a 3/3 Ogre token for each one
Challenging deck-building assumptions is going to give players tons of room to experiment and be rewarded, in everything from Limited to Legacy