Requiring five cards that are useless outside of this specific combo is a heavy deckbuilding cost, one we can avoid given that we have more efficient lines with Hulk
and of course, Beast, Tragic Hero
Card 14 will always be either a foil showcase (for Midnight Hunt, the Equinox style) or borderless common or uncommon
Both sides of Valki are excellent, with Valki being hand disruption useful in the early game to steal a powerful creature (with the potential to turn into it later), while Tibalt is a great end-game card, capable of removing multiple creatures and stealing cards from your opponents' libraries to cast yourself
As a card type with a fundamental impact on how we play the game, there are tons of powerful creatures
Which begs the question: If the namesakes aren't the best at this, then what cards are