Attend local tournaments, meet other players, and engage in discussions on forums or social media platforms dedicated to these games
Slifer can be trapped by Dragon Capture Jar, while Ra's ATK and DEF are greatly reduced if you're playing on a Sea Field, due being Dragon and Machine-type monsters respectively
Timmy, Power Gamer I use these cards occasionally, but you need to make sure you are in the right metagame or playgroup to ensure they arent hated out
New Sacrifice Cards So Phyrexian Tower into Warren Soultrader into the rest of the Rakdos sac stuff into Marionette Apprentice, which is almost Mayhem Devil Apprentice
Another drawback is that although there is no separate cost, there is a limit to what can be used, so even though it is a boosting card, its staying power is low
You can build an excellent Water-type deck with little effort, and your opponents will have a hard time stopping you once you get rolling