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In both cases, you take a perfectly serviceable support role, add 3 mana, and then have a creature that still has that ability, sure, but that can win gameswith a big ol beater

In cube you can't really have 10% of your deck as one mana discard cards as their are not enough, the options become too weak too quickly and the good ones get hoovered up very quickly

If you're running Silencer as part of your morph suite, it's because you want to hide some additional countermagic beneath your army of mysterious morph creatures

My best advice for players new to Modern would be to identify the kind of decks you like in other formats and see which decks in Modern look like those, and whether they look interesting here