At the time, I had yet to be involved in Pokemon Cards, so this is what Ive heard, but it was Creatures founder [Tsunekazu] Ishihara who at the time was studying board games of all sorts
Even if you're aiming to use an attack that won't cause any damage, the coin flip is still necessary
Pokemon Card - Gym Heroes 6/132 - LT
Fact or Fiction became such a powerhouse that it became an anagram for Vintage - "EOTFOFYL" which stood for "End of Turn, Fact or Fiction, You Lose." It led to dominant new decks in Vintage (such as a mono-Blue build called "BBS" for Blue BS which led to Morphing) and was ultimately restricted
Faeburrow Elder not only taps for 1 mana of each color among permanents you control, but it also grows larger with every color represented, so its both a ramp engine and a solid body
Beginning of combat Not much happens here unless there are triggered abilities that say at the beginning of your combat step