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We certainly can expect them to be added as rewards in future promo events

Ramunap Excavator is a weak and situational Courser of Kruphix in a random situation however when you get a bit of synergy the value of Excavator goes through the roof

In this case, nature itself

Alternatively, it can be used to take Stardust Synchron and summon it from the hand, or send it to the graveyard with effects such as Synchro Fellows and summon it from the graveyard

UR Ultra Rare Naturia Stinkbug X EARTH Level 3 [ InsectTunerEffect ] ATK 200 DEF 500 When a "Naturia" monster you control is targeted for an attack (Quick Effect): You can send this card from the field to the GY