The most common evolved Pokmon card used for this purpose is the Dusknoir card from Night Wanderer [SV6a] as shown by, for example, the Terapagos ex/Dusknoir and Palkia VSTAR/Dusknoir decks
Chart shows the price of Exeggcute [Reverse Holo] #2 at the end of each month going back as long as we have tracked the item.
The eighth most expensive card in the Crown Zenith set is the Irida Trainer card ($32) followed closely by other Trainer cards like Cynthias Ambition ($27), Melony ($19), and Gardenias Vigor ($14)
The alternative commander is Kotis, Sibsig Champion, which, once per turn, lets you cast creature spells from the graveyard if you pay their original cost and exile three cards from there as an additional cost
Technically, almost every card in Magic falls under this umbrella, but this sheet is really about instants and sorceries
All 3 of the Tamer monsters have an effect that will summon another Ritual Beast monster in some way, so it stands to reason you would use that effect to get a Spirit Beast and this would allow you to fusion summon
