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)
Stitch in Time breaks that mold, but I still think its the best option for coin flip cards
If you havent played these cards, you might not see that theyre often two-for-ones
Featured in a few of these precons
Its not something many MTG cards refer to or interact with, but Ancient Adamantoise from Final Fantasy is an exception
The mechanic can be quite powerful, but since Kaladesh and Aether Revolt, Energy hasnt received a ton of support