Last time we remember everyone running book of moon in 2 or 3s especially during the bf and cat formats.
This format every one is running multiple conpuls !
Like book of moon they do similar things. Both are a possible -1 as turning opp card downwards with no answer to it next turn sucks while, bouncing opp monster to hand to Avoid a combo is also a -1 if not played right.
They both also help evade stuff like skill drain and veiler. Say you want to gagaga gunman you can just cost and activate either and avoid veiler and drain. Something similar ppl use to do is book black rose if it gets veilered
With compulsory, you can evade monster destruction and Just send it back to your hand
Lastly compulsory is the best card to remove boss monster in the form of extra deck card which gives it that versatility over book of moon while book lets you turn things face down so you can kill them by battle next turn.
Compulsory is one of the best removal cards this format. Aside from torrential and bottomless trap hole it is one of the few possible main deck cards to slow down mermail since solemn warning does shit vs megalo. You can return megalo to their hand and if they have thrown away their atlanteans then they need to set up again. And mermails weakness is the setting up of their decks. However if they open pike, drop marksman then no comment :x then again you shouldn't be setting your conpuls until you read megalo. And if they summon pike then they can't otk anyway so sure let them overextend with megalo then kill them after. The reason why I keep mentioning mermails is because it is the decks like hero beats general worst matchup.
That's all for today