It's the way it has perfected the art of F2P mobile games
However, the point that summoning conditions are still heavy pulls a leg
Booster packs have a variety of random cards, which won't necessarily work with your deck, but you could get some really good cards
Its completely understandable to say to deck with it, and find something already built online, a practice called netdecking. Lots of Magic websites that catalog or archive decks show you the decklist and also provide a copiable list so that you can import the deck to MTG Arena or MTGO
On Rare Candy, you can browse every card in the set and track your collection progress as you go
Special Summon 1 "Gladiator Beast" monster from your Deck, except "Gladiator Beast Retiari"