No one knew how big MTG was going to be, and Rush certainly wouldn't have known that this Forest and the others for the first set would still have been talked about decades later
Its a very strong engine of repeatable death, as the cycle of life brings you cards from the best or worst of your lot
Leaf is basically a better version of that card: It reduces the retreat cost of your active Pokmon by two for the duration of your turn
It takes some work to make Muldrotha work, but if you've got good mana, are good at milling yourself, and you have lots of permanents, it's probably going to be the strongest card in your deck
There are also great ninja lords, like Silver-Fur Master and Splinter, Hamato Yoshi
It lets you profit from self-mill synergies in combat whenever any frog (not necessarily Grolnok itself) attacks