This might include the method in which something is made being unique to the time, the materials used, cultural phenomena of the era, or the style of the object reflecting the aesthetic preferences of the period
Let's go with green
Every single trainer card is a supporter, and all of them have some type of competitive use
(An exerted creature won't untap during your next untap step.) Creature - Human Warrior Flamerush Rider Whenever this creature attacks, create a token that's a copy of another target attacking creature and that's tapped and attacking
While the "ease of flipping" category is, in large part, a product of the number of defense counters on the battle (battles range from three to seven defense counters, and a battle with three defense counters will be much easier to flip than one with seven), it also takes other factors into consideration, like whether the battle makes creatures (if so, we can use them to help defeat the battle, making it easier to flip) or whether the battle acts as removal (which can get a blocker out of the way, making it easier to attack and defeat the battle)