Thanks for the summon @alplod!
Fractal Replication sounds so awesome that every Magmar main tried (or should have tried) to make it work. And sometimes it does work exactly as you hope for. Getting 3 (buffed) Makantor Warbeasts or Elucidators or Mandrakes or Angered Okkadok or like in the hilarious video Worldcore Golems or just any buffed minion seems like to offer good value for the card.
There are some problems though with that. 6 mana is pretty expensive and at 6 mana you want to put down something really threatening and while Fractal Replication can be that it needs a board and good players always try to deny you your board. And even worse the summoned copies are exhausted (except with Rush minions), so you don’t get immediate value from it and that’s something no good player likes because this makes the card pretty slow.
Not only is it slow and expensive but often it is also a dead card because it can’t do anything on its own and that makes it hard to justify the deck slot for it.
I recommend looking at these guides. They cover everything from increasing your collection for free, to deckbuilding, to disenchanting, to great budget decks, to positioning (very important!) and whatever else you need.
And like @alplod said I offer to make replay analysis videos (or even live coaching). Just tell me what game you want me to watch because you are unsure why you lost it or because it was so totally one sided.
Stick with the game, there is a lot to learn but it is so rewarding to learn and adapt Also the guys here are usually pretty fun and nice, just confused by the topic. But if they were honest they would admit that they all had problems with similar stuff. At the start so many cards seem OP till you learn how to handle them and suddenly you see their weaknesses.