pokemon sun and moon ultra prism booster pack 3-Pack Hanger Box – Common Lands GX and Palkia Pokemon Sun & Moon Ultra

One way WotC can achieve that is by reprinting cards that are in unusually short supply

I dont think this would be worth it in most decks, but it could be a cool inclusion in something like Nymris, Oona's Trickster, which frequently passes with mana open

One of the best things about the card is how flexible it is on the mana cost

There are a few other ideal ways to pick up planeswalkers, but since there are so many, the best answer really is to buy singles through a marketplace like TCGplayer

It doesnt make the opposing creature deadlier, but it will give all the Killian, Decisive Mentor triggers, and if its designated target gets killed, you get a small chump blocker and the enchantment is back in your hand to do it again