Obelisk is a good, reliable card, with fixed stats that are easier to build a deck around than its other Egyptian God counterparts
I would also consider one or two copies of Arabella, Abandoned Doll, which rewards you for going wide with small tokens while acting as a Gleeful Demolition target if the need arises
The Generation VII set Lost Thunder has three cards depicting Unown, all of them allowing the player to win the game if some difficult condition was met: The group spelling out "MISSING" will win you the game if your opponent's Lost Zone contains 12 or more Supporter cards, the group spelling out "DAMAGE" will win you the game if your Pokmon collectively have 660 or more HP of damage sustained at a time (including the group itself), and the group spelling out "HAND" will win you the game if you have 35 or more cards in your hand
Always ensure your hands are clean and dry
Out of the few dozen that exist from various sets and expansions, the best are the ones that can dish out the most damage as well as possessing useful secondary effects and granting a generous amount of maximum HP
Hope some of you find this as satisfying as I do