Trading creatures or even using your creatures as sacrifice fodder provides huge upsides
While there are guidelines to keep in mind when deck building (no Game Changers in Exhibition or Core, no mass land denial through Upgraded, etc.), the bracket system is emphatically not just "put your deck into a calculator, get assigned a rank, and be ready to play." I deeply appreciate the tools that websites like Moxfield and Archidekt have put together to give you an overall estimate, and they've done some fantastic iteration to help emphasize intent as wellbut I want to stress that any estimate is just an estimate
You always have the option of playing a fair Simic game plan that looks to accrue value rather than dedicate itself to a specific synergy
In a day and age where everyone is trying to make a quick buck off you, places like this still exist, go support them, you wont regret it
When it comes to noncreature spells, Blitzball Stadium rewards you for moving different types of counters to creatures by letting you keep your hand full, and Protection Magic helps you protect your most important creatures for a very low cost
Back in the day, there used to be specific Pokmon connected to specific trainers, like Mistys Starmie and Brocks Onix