Since it can destroy opponent monsters in response to an attack, it can also deal with monsters already on the field, but it can be countered by Decode Talker or Gatchiri @Ignister

Spoiler Monsters: 3 Black Chaos the Ultimate Magical Swordsman 1 Invader of Darkness 3 Royal Archfiend 1 Skull Archfiend of Chaos 1 Duke Archfiend 3 Highness Archfiend 1 Archfiend Heiress 2 Gurifoh 1 Black Luster Soldier Soldier of Light and Darkness 1 Black Chaos the Dark Chaos Magician 2 Archfiend Emperor 2 Doom Regina Archfiend 1 Archfiend Matador 1 Miracle Raven Spells: 3 Pre-Preparation of Rites 2 Readying of Rites 3 Preparation of Rites 2 Throne of the Archfiends 1 Ritual of the Matador 2 Ritual of Light and Darkness 1 The Gaze of Timaeus 3 Archfiend Usurpation 1 Mystic Box of Chaos 1 Archfiend Strategy Traps: 1 Archfiends Ghastly Glitch 2 Stars Align across the Milky Way 1 Urgent Ritual Art 1 Archfiends Fervor 1 Red Dragon Archfiends Chain 2 Mind Shuffle Extra Deck: 1 Red-Eyes Dark Dragoon 1 Master of Chaos 1 Dark Magician of Destruction 1 Chaos Angel 1 Red Dragon Archfiend 1 PSY-Framelord Omega 1 Super Starslayer TY-PHON Sky Crisis 1 A Bao A Qu, the Lightless Shadow 1 Accesscode Talker 1 Four Charmers in Profusion 1 Selene, Queen of the Master Magicians 1 Masterking Archfiend 1 S:P Little Knight 1 ASHLAN U1000 1 Cross-Sheep Variant Four: Chaos Ritual with Hecahands Illusion Replays: If the embedded video does not function properly, check out this video on YouTube

Every Aroma monster has at least two effects: Their continuous effect is active while your LP are higher than your opponents and you control the monster, with the exceptions to that pattern being Loading
The problem with Pot of Greed is that EVERYONE used it, which just goes to show even the show writers knew how strong it was
In return, Regenesis gives Nemleria a stronger endboard when going first, such as omni negates, bounces, and Spell/Trap banishes