That means its subject to cost-reducers, like Defiler of Faith and Heralds Horn

Advanced Search Sets Random Syntax Aatchik, Emerald Radian Altanak, the Thrice-Called Ambush Gigapede Ant-Man's Army Anthropede Biomechan Engineer Biotech Specialist Blade of the Swarm Broodguard Elite Buzz Bots Buzzard-Wasp Colony Chitin Gravestalker Comet Crawler Cuboid Colony Delta Bloodflies Dragonfly Swarm Eumidian Terrabotanist Flesh Burrower Gene Pollinator Genemorph Imago Giant-Sized Flying Ant Huskburster Swarm Icetill Explorer Insatiable Skittermaw Insectoid Exterminator Intrepid Tenderfoot Kraul Whipcracker Krenko's Buzzcrusher Krotiq Nestguard Lord Dregg, Insect Invader Meltstrider Eulogist Mightform Harmonizer Molt Tender Nessian Hornbeetle Piranha Fly Primordial Gnawer Rot Farm Mortipede Seedship Agrarian Seedship Broodtender Skullsnap Nuisance Skystinger Spineseeker Centipede Stinging Cave Crawler Stockman, Mad Fly-entist Swarm Culler Swarm, Being of Bees Thawbringer Virus Beetle Webstrike Elite Wekhdu, Midnight Hunter

Yes, you need your Pokmon TCG deck and an opponent to get started
The tradeoff for a lot of those cards is that their power is much lower than other creatures, so winning through combat damage isnt going to be very high, at least with your own creatures
Upgrading Exit in Exile Exit in Exile is a fairly well thought out deck