1- Well, Ditto is by far, the BCIF. Put 4 of him in a deck with 54 energies, 1 Wynaut and an E-Belt and you have the BDIF.
2- Ditto is the metagame. Nothing beats ditto. Ditto is the rock paper and scissors without the weakensses.
3-Ditto is a combo paradox. He needs nothing else to win. However, he does have the ability to turn into those new Digimon from Nightblack and Lightwhite. So he can also sacrifice 300 monster points in trap mode to activate a discard mount. Equip him with a Memory Berry and he's a killing machine. He simply copies the attacks from the playmat and table underneath him. This, combined with his attack bonus, is enough to kill almost all Pokemon.
4- I'd rate it ∞/1. Honestly, you have to run this card in you deck. No,you have to run this card in your deck and use it as your sleeves. Wait, scratch that. You must run this card in your deck, use it as your sleeves, cook it with bacon composed of Ditto on a stove made out of this Ditto in a house built from a Ditto TC on an Earth formed from a Molten Ditto Card in a tiny sector of space that is a single molecule composing a single cell from the universe that is Ditto.
5- Amazing. I especially like how there is a picture of Ditto. And how the picture is a square. And how there are two copies of this card, one shiny and one not. By law, they had to make a non-shiny edition to give to Chuck Norris, who would be angered to have seen the shiny one since it is so much more epic then him. Did I mention that I love how they crafted the Ditto to look like Gabe Newell?