Gaea's Cradle The best MTG land you can actually play An land only needs to produce two mana when you tap it to be, objectively, broken
Creating Flair requires using up duplicates of the same card , so it gives players something to do with those 10 extra copies of Metapod they don't actually need
Sets that primarily take place there : None Planeswalker natives (with planeswalker cards) : Jace Vryn is Jace's homeworld
The same is true of cards collected prior players logging into the game today will find that most of the challenges and themed collections tied to the new expansion will be completed already

Decklist: Unlocked by default: 2x Cathedral of War 4x Evolving Wilds 9x Plains 11x Swamp 4x Duty-Bound Dead 2x Servant of Nefarox 2x Duskmantle Prowler 4x Aven Squire 1x Battlegrace Angel 2x Child of Night 2x Daggerclaw Imp 1x Deathbringer Liege 3x Guardians of Akrasa 1x Silent Arbiter 2x Tormented Soul 2x Ring of Xathrid 2x Angelic Benediction 3x Doom Blade 2x Pacifism 1x Seize the Initiative 1x Whispersilk Cloak Unlockable: 1x Nefarox, Overlord of Grixis 2x Knight of Infamy 2x Akrasan Squire 1x Guardians of Akrasa 2x Darklit Gargoyle 3x Knight of Glory 2x Unmake 1x Sublime Archangel 2x Spirit Mantle 1x Silent Arbiter 1x Cathedral of War 1x Whispersilk Cloak 1x No Mercy 1x Debtors Knell 1x Sigil of Distinction 2x Angelic Benediction 1x Mark of Asylum 1x Mighty Leap 1x Divinity of Pride 1x Deathbringer Liege 1x Sword of Vengeance 1x Vindicate

Setting up a spot where you can sacrifice Cyan to gain card advantage and make each opponent lose seven life, just to bring Cyan back with Terra is awesome