Players could use it defensively to save their creature or temporarily remove an attack, or proactively to blink their large creature or temporarily remove a blocker
As you likely know, lifegain for its own sake is awful but incidental lifegain is often outstanding
You spent 4 mana, and it enters as a 2/2
Even just paying one mana to turn this spell into a basic land card is going to be useful in some games, but being able to find any creature you need, especially in a format like Commander, can be the difference between winning and losing
The idea was that because most creature cards have two creature types, we could create an environment where players could pick and choose multiple creature types to focus on in a deck
Some decks will be very happy with it, while others wont care too much