Factory-sealed Wizards of the Coast product
The Sojourner cycle from Alara Reborn has a number of interesting effects which could be reasonable choices, depending on what you're trying to accomplish
Silver-Fur Master grants so many options on its own, and it can turn an already-good ninjutsu deck into a near-unbeatable ninjutsu deck (so long as the draws are good, of course)
A copy effect looks at the object in the game it is trying to copy, usually a permanent on the battlefield or a spell or ability on the stack, and uses that object as a template to determine what the copy should look like
[38] When you get Pokmon cards authenticated, a grading service inspects the card and gives it a score based on the condition
Control and midrange decks: These decks can use the protection turn to stabilize, then use the draw ability to stay ahead in longer games