Sure, your opponent gets too as well, but if youre dropping a creature with an exceptionally powerful enter the battlefield trigger, like Atraxa, Grand Unifier, a creature that is practically unstoppable like Emrakul, the Aeons Torn, or an enchantment that gives you free rein to do whatever you like Omniscience, you basically guaranteed a win
Excava wants us to build in another way, and incorporate a lot of flicker to get rid of the finality counters and grow out creatures back to full size
But if you are going in heavily on a vehicles theme then these two abilities form an extremely consistent and efficient resource engine, and one which basically guarantees youll have other vehicles around to fuel your other synergies around the card type
Theres nothing better than grabbing a handful of boosters, shuffling them together, and just jamming with friends
To justify that sort of mana cost, there need to be one of two things: a cost-reduction or a solid effect stapled to it
Meanwhile, the newly added tool category of cards remain attached to the Pokmon theyre given to, enabling them to have more offensive, defensive or strategic potential