Not only does it create a bunch of plants when it comes in, it also grows all of your plants, including the non-token ones
Then you've got the upkeep trigger to make a free 4/3 Vampire and Demon with flying token dork if you have enough devotion
Francisco, Fowl Marauder cant block, but he will get pretty chunky pretty fast if you play your cards right
Or do what an increasing number of people do, and build an MTG Commander deck - it's a lot less painful to buy that mythic rare when you only need one copy.
The worst thing about playing decks like reanimator is being stuck with an 8- or 10-drop in your hand, so you can use Nourishing Shoal to gain a bunch of life with that card
Refinement: Based on playtesting results, the deck is refined