This means, for example, that a Modular creature would come into play without it's +1/+1 counters and then be destroyed by state based effects
Sacrifice after III.).I You may exchange control of two target creatures.II You may exchange control of two target nonbasic, noncreature permanents that share a card type.III Target player loses 3 life and you gain 3 life
However, the cards are legal in Modern, and of course Commander
By letting any creature in a player's hand have Ninjutsu, some terrifying targets can be put onto the battlefield way before someone could cast them
This is also the category with my favorites, so prepare for some (more) text Thing in the ice is a joy, it's juuuust hard enough to flip to feel great
The Planeswalker doesnt really establish itself as a massive threat outside of this, which may incentivize players to ignore it in exchange for card advantage