Due to planeswalkers being so great almost all of these will have some Duress targets but the problem is that you don't have good odds on getting a hit, even on turn one, making Duress a bit dodgy
If we're going to play with Skrelv, we're going to poison people to death, and for some reason, people don't like that
The constant pressure of the best Auras MTG allows you to commit to aggressive plays without the fear of losing your resource investment to a simple removal spell
The more complex ones require specific actions or conditions
The creature goes to the graveyard but the equipment falls off and remains on the battlefield , unattached
This way, instead of it trying to carve out its own space in the color pie, it would borrow equally from all five colors