While the images for these cards are confirmed, the Venusaur, Charizard, and Blastoise (and Professor Oak trainer card) have not been finalized yet
However, Nidoking received a single sticker card as one of the previously mentioned Bonus cards
While some cards are worth nothing, there are some extremely rare and extremely valuable cards
When you can cost-reduce this down to one mana, why wouldnt you play it here
As an example, here is John Rolf build from the MPL: Creatures (27) 3 Knight of the Ebon Legion 4 Foulmire Knight 4 Smitten Swordmaster 4 Order of Midnight 4 Lovestruck Beast 4 Murderous Rider 4 Edgewall Innkeeper Planeswalkers (1) Lands (23) Spells (9) Sideboard This is the grindiest of builds, as it runs the card advantage from both the Innkeeper and the Clover
For these decks, the opportunity of playing Jegantha, the Wellspring is just too high, not because of the number of cards they can't play, but because of the power-level of the small number of cards that don't meet Jegantha, the Wellspring companion restriction