If you can defend this Dimir planeswalker , you should be able to exile opposing graveyards three or four times, making it hard to build a full graveyard
You can use this flexible construct as a beat stick that grows, as a card draw engine if you can sacrifice it, or even as a wincon should you draw your entire deck
So you cant play Memorial to Genius in either your Gishath or your Judith deck, because its blue
The spell was broken after an encounter with a frozen esper, and she joined a rebel group known as the Returners to fight against the imperial regime
This kills most Planeswalkers and it is an incredible sweeper against the Heliod Company deck because it gets around Heliod, Sun-Crowneds indestructible ability

Ayara's Oathsworn Beseech the Mirror Beseech the Queen Bogbrew Witch Brainspoil Bringer of the Black Dawn Case of the Stashed Skeleton Coveted Prize Cruel Tutor Cynical Loner Dark Petition Demon's Herald Demonic Bargain Demonic Collusion Demonic Tutor Diabolic Intent Diabolic Intent Diabolic Tutor Dimir House Guard Dimir Machinations Emeritus of Woe Entomb Gravebreaker Lamia Grim Servant Grim Tutor Hoarding Broodlord Hour of Victory Illicit Shipment Imperial Seal Increasing Ambition Infernal Tutor Insatiable Avarice Liliana Vess Lively Dirge Mastermind's Acquisition Netherborn Phalanx Oriq Loremage Profane Tutor Razaketh's Rite Razaketh, the Foulblooded Rhystic Tutor Rune-Scarred Demon Servant of the Stinger Shred Memory Sidisi, Undead Vizier Smuggler Captain Splinter's Technique The Creation of Avacyn The Cruelty of Gix Urborg Panther Vampiric Tutor Vile Entomber Whisper Squad Wishclaw Talisman Witty Demon (playtest)