Your sideboarding is pretty straight forward in any given matchup, you choose which of the four sideboard cards you want to bring in (Thoughtseize/Leyline of Sanctity/Ancient Grudge/Prismatic Ending), and you additionally bring in Gemstone Caverns if youre on the draw
You cannot play the mismatched face of a mismatched double-faced card, and mismatched DFCs do not represent mechanically unique printings or unique Booster Fun treatments
To do that, you compile a deck of at least 60 cards (maximum copy of any one card is 4) utilizing two of the six Ink colors
Then this is a seven-drop on the front side and with 7/7 flying, first strike and lifelink - strong stuff
But declare an attack with JC, and its 10,000 Needles ability balloons it into a massive 10,000-power Freight Train of Death that guarantees it'll deal lethal damage to any creature blocking it or one-shot any opponent if it connects