Temporal Forces is especially notable in the Pokmon TCG community for reintroducing what some may have thought was a new Pokmon card type: ACE SPECs, which are extremely powerful, one-off trainer cards
Until your next turn, each player may attack only the nearest opponent in the last chosen direction and planeswalkers controlled by that opponent
They can be recognised not just from their spectacular foil treatment, but also by their stamped, individual card number
The front side of Ballista Watcher is pretty bad: sure, you can pick off a random utility creature like Birds of Paradise, but you have to spend 3 mana and tap it, not great
To further protect rare cards, you might want to encase each in a special plastic card sleeve intended to keep rare cards pristine