Another reason I think a banning is unlikely is because I have no idea what Wizards would ban, since there isn't really one card or even one deck that is dominating the format
While players likely will not use the Joltik to attack, N's Zoroark can copy this attack while Joltik is on the bench, which might be a secondary strategy for the deck so that it can slow the game down or deal with Budew in the Dragapult ex matchup
Hermes, Overseer of Elpis* Another take on a Talrand type of effect, this trades down the size of the creatures for typal Bird synergies (vigilance!), and scrying
Weavile ex also happens to come in the same set as Darkrai ex and Dawn and only needs 1 Energy for its attack, forming a combo where you can ping an opponent with Darkrai ex, then shift the Energy from Darkrai ex onto Weavile ex and maul the opponent
You wont have to ask many people before you find a Commander player who has a bad beat story with this card
Lone Missionary Lone Missionary is a staple of Pauper formats and lifegain-based decks