mtg altered cards legality Can with covered wording be played in tournaments or leagues? Is it legal to play

Heres an example of CoCo style list

Making effective multiformat cards was especially important for our set

But we know how broken Memory Jar was, so a Standard legal one with this many breaks may not be great for Standard, but it will be amazing as another addition to artifact matters or cool card flow

However, when its a creature, if it would deal combat damage to a creature, it instead makes it so that the owner has to shuffle that creature back into their library

I'm so low on life, at this point I need to %100 control the game or lose but I'm in a decent position to do it with the Yawgmoth

Polish later : Add powerful finishers or tutors once consistency is locked in