Its very enabling and allows one card to be played many times on any given turn that it would best be useful
Hence, all you can do is bow down against this spell if ever it ends up being put into play, because unless you're able to counter it or remove it as it goes into play, you're smoke

Akawalli, the Seething Tower Blightreaper Thallid Blightsower Thallid Boneyard Mycodrax Brackish Trudge Broodrage Mycoid Cankerbloom Corpsejack Menace Corpsejack Menace Deathbloom Thallid Deathbonnet Hulk Deathbonnet Sprout Deathcap Marionette Deathspore Thallid Feral Thallid Fungal Behemoth Fungal Colossus Fungal Shambler Fungus Elemental Fungus Sliver Fungusaur Ghave, Guru of Spores Insidious Fungus Lichenthrope Mindbender Spores Mold Adder Mold Demon Mold Folk Mold Shambler Molderhulk Moldgraf Scavenger Mycoid Shepherd Mycoloth Myconid Spore Tender Pallid Mycoderm Placid Rottentail Psychotrope Thallid Rhizome Lurcher Rot Shambler Saurian Symbiote Savage Thallid Skullcap Snail Slimefoot and Squee Slimefoot, the Stowaway Slimy Piper Sowing Mycospawn Spore Crawler Spore Flower Sporecrown Thallid Sporemound Sporesower Thallid Sporoloth Ancient Sproutback Trudge Swarm Shambler Synapse Necromage Tendril of the Mycotyrant Thallid Thallid Devourer Thallid Germinator Thallid Omnivore Thallid Shell-Dweller Thallid Soothsayer The Mycotyrant Thorn Thallid Tukatongue Thallid Undercellar Myconid Undergrowth Scavenger Utopia Mycon Vitaspore Thallid Xavier Sal, Infested Captain Yavimaya Sapherd

Heck, I even love Lord of the Rings Risk
In this article, I want to talk about the history of the reserve list and how it affects cards now and in the future