The Lord of the Rings: Tales of Middle-earth set in 2023 is a good case study: one card in the set, the One of One Ring, was printed as a genuine 1/1, and the speculation alone drove demand for sealed product to significant premiums
This is depicted in a Red, White, and Black card called Fire Lord Zuko, which retains its firebending mechanic, but now has possible combos in MTG tied to ally creatures and casting from exile, which airbending does a lot of
Monologue Tax is also in the list, but it only triggers to give me a treasure token when an opponent casts theri second spell each turn
The only issue for Delighted Halfling is the existence of Orcish Bowmasters, which can potentially kill it if someone draws more than one card a turn, and another opponent has the opportunity to Flash in Orcish Bowmasters