SCARLET WITCH, CHAOTIC AVENGER Scarlet Witch works with Hero decks, but also works just as great in a spellslinger deck
Repudiate / Replicate One of the good things about split cards is allowing the user to play narrow effects, and fewer cards are narrower than Stifle (Repudiate)
Again, his abilities are stackable, meaning he gives a bonus to goblins, and any other card that gives a bonus combines with it
This was turned into planeswalker Commander form in Daretti with a +2 to discard and draw up to two for recursion and then -2 to Goblin Welder
However, it can be one of the strongest cards in the game in the right decks and under some circumstances, as it has the What A Mess ability that reads "During your turn, you may banish chosen Item of yours to play this character for free." Belle's ability is fantastic for Sapphire Lorcana decks because a lot of them run at least some Items, especially the 1-cost Pawpsicle in four copies
Gandalf, White Rider will be there