You have complete control over what you put in the trade binder and what you want to keep for your collection
I was absolutely wowed by how versatile it was
Note, this is a special case where the collector number does not help you because the other side of the card is the primary scene
Aside from Oathbreaker, its restricted in the only other format we can play it in, Vintage, like many other cards from this list
You can then tap it and remove it the counter on it to add the exact amount of mana you spent to attach the counter and card in the first place, and then that mana can only be used to cast the card attached to Ice Cauldron
Like all the best cats and people, he's in green/white, with a go-wide, +1/+1 counter theme