The most hyped cards, Sothera, the Supervoid, Tezzeret, Cruel Captain, and The Seriema, are direct representations of the storys biggest elements, a design choice that proved incredibly successful with sets like The Lord of the Rings
If an effect instructs a player to meld cards that cant be melded, those cards remain in exile
Where the card becomes interesting is in decks that care about sacrifice effects, temporary theft, or opponent interaction , allowing the Goat to act as a disposable resource instead of a threat
Basically, dont make any assumptions before hopping in
In the last few years, Wizards has begun to push the design of expensive creaturess a lot more, particularly in ways which skirt around improving those inherent drawbacks (like making them enormous!)
1 Vraska, Relic Seeker