In these decks, Flood of Tears isn't just a mass bounce spell, it can even be a ramp spell, letting you pay six mana to "ramp" out a a haymaker like Void Winnower, Jin-Gitaxias, Core Augur, or Nicol Bolas, Planeswalker
The answer is a combination of product strategy and what could be called the lottery ticket effect
Wizards runs officially licensed tournaments, but there are thousands of other unofficial tournaments where anything goes
Dalek Drone Everyone loves a Ravenous Chupacabra
Because state-based actions don't destroy a creature with lethal damage marked on it until a player would receive priority, gaining indestructible from Outmuscle will save your creature if it's dealt lethal damage in the fight
These five cards would be the first two-in-one cards