Cards like Whisperwood Elemental and Mastery of the Unseen were Standard mainstays the entire time they were legal in the format
The problem with this is it is introducing needless complexity two keywords for two very similar mechanics would cause more confusion than simply writing the effect out in full on the card.
Practice is key here, if you know the D00-DL, Caricaturist is in your deck, have an idea of how youre going to draw that critter, especially those menacing eyes
This is also a good way to finish off someone if you have an instant/enchantment that will win the game
Yes, that means you can get your hands on a copy of a set 6 card, Oswald - The Lucky Rabbit, months before its actual release
The five secret rares add roughly $100-150 to your total cost but are required for a legitimate master set