After much discussion, we decided to free the Otter
That is great in Rakdos with Cabal Coffers and Urborg, Tomb of Yawgmoth or with Gruul's ramp like Cultivate and Rampant Growth and Explosive Vegetation to reliably get to that 8 mana
Lets nominate some cards for being the best at what they do

Abomination of Llanowar Astarion, the Decadent Ayara, First of Locthwain Ayara, Furnace Queen Ayara, Widow of the Realm Belbe, Corrupted Observer Blightsoil Druid Briarblade Adept Compleated Huntmaster Creakwood Safewright Dawnhand Dissident Dawnhand Eulogist Deadbridge Shaman Deathbloom Ritualist Deathknell Berserker Deathrite Shaman Drey Keeper Drider Duskwielder Eclipsed Elf Elderfang Disciple Elderfang Ritualist Elvish Doomsayer Elvish Dreadlord Elvish Vatkeeper Estinien Varlineau Exquisite Huntmaster Eyeblight Assassin Eyeblight Cullers Eyeblight's Ending Gilt-Leaf Winnower Glissa Sunslayer Glissa, Herald of Predation Glissa, the Traitor Gloom Ripper Glowspore Shaman Gnarlroot Trapper Golgari Findbroker Golgari Guildmage Harald, King of Skemfar Haunt of the Dead Marshes High Perfect Morcant Hired Hexblade Hunter of Eyeblights Infestation Sage Iron-Shield Elf Izoni, Center of the Web Izoni, Thousand-Eyed Jarad, Golgari Lich Lord Jon Irenicus, Shattered One Kagha, Shadow Archdruid Kalain, Reclusive Painter Kethis, the Hidden Hand Koma's Faithful Korozda Guildmage Krydle of Baldur's Gate Lathril, Blade of the Elves Leovold, Emissary of Trest Llanowar Dead Lluwen, Exchange Student Lluwen, Imperfect Naturalist Lys Alana Scarblade Maralen of the Mornsong Maralen, Fae Ascendant Melancholic Poet Miara, Thorn of the Glade Minthara, Merciless Soul Moonglove Extractor Moonglove Winnower Morcant's Loyalist Nadier's Nightblade Nadier, Agent of the Duskenel

Youll build around Pokmon evolutions and trainer cards, which feel like instants and sorceries in MTG
Nicol Bolas, the Ravager and Nicol Bolas, the Arisen Ive already written plenty about Nicol Bolas, the Ravager when I gave Core Set 2019 its report card a couple weeks ago