If you tap a multicolored creature, you can choose which cost it's covering
Once a creature becomes monstrous, it can't become monstrous again
Its exactly the same effect as blink, (named for the Time Spiral card Momentary Blink (although Momentary Blink only targeted Creatures, while Flicker hit nontoken permanents
Many are banned or restricted in one format or another, or at least have a history of such
If you need anything done, he is the best man for the job
For years, Lightning Bolt was so powerful that decks like Jund and Jeskai Control were essentially splashing red just for it, but now the cards in the format are so powerful that decks that play red and want that effect dont even necessarily want the full four-copies