What would you do if you had 4x Foil Jace and 4x Foil Tarmogoyf? It's damn desirable as a pimp to play with those cards, but they are too risky to hold because wizards WILL reprint them. Maybe not now, but they will do it. They did it to Goblin Welder (which used to be a very pimp foil) and even imperial recruiter and loyal retainers. It will only take time before Imperial Seal will get axed like this too. Why hold on to these expensive cards if you are exposing yourself, not to risk, but to inevitable decline.