Cold-Foil is a slightly different variant of foil and is used to enhance the background of the Rare to Legendary cards, whereas your Enchanted cards have a more traditional full holo-foil print design
Excalibur II needs to pick up at least three charge counters before its worth equipping, and thats just not going to happen often enough to justify running it
For instance, a character might generate one example token every turn theyre on the board, and when they get to three of them, you can discard the tokens to banish a character
Lets get the elephant out of the way first
A canny Steelsong player can be singing by turn 3, wiping their opponents' slate clean while racking up lore at an obscene pace via Sleepy's Flute
For each card, Ive listed the EDHREC data, but please keep in mind that its not a perfect set of data