Birthing Pod and cards like it are fun to build around, and ask you to incorporate a chain of creatures in your deck so you can work towards gradually more and more expensive creatures
Alternatively, you can bring back Rebecca as a blocker, who will then play Spandine, setting up Rob Lucci from the trash
Those versions are worth a cool $140, with the promos all fetching several hundred each
And the phenomenon repeats on a more modest scale with modern expansions: Celebrations, Evolving Skies, and Crown Zenith follow a similar curve, with returns ranging from 80% to over 1,700% over 3 to 5 years depending on the product and its desirability
Im also a total sucker for magic spheres of energy
Since Grolnok allows exiled spells and lands with croak counters to be played, it can offer incredible card advantage , provided you have a fighting force of Frogs ready to attack each turn