Each of these phenomenal 40K decks has its distinct game plan
Accumulate Wisdom allows you to draw three cards for just 2 mana, if you have three or more lessons in your graveyard, so its an interesting payoff for a spellslinger deck filled with lessons
It stays on their battlefield, and when state-based actions are checked, it tries again to save them from losing the game to the poison counters, resulting in an involuntary loop that ends the game in a draw

Abomination of Llanowar Belbe, Corrupted Observer Deathbloom Ritualist Deathrite Shaman Drey Keeper Eclipsed Elf Elvish Vatkeeper Glissa Sunslayer Glissa, Herald of Predation Glissa, the Traitor Glowspore Shaman Golgari Findbroker Golgari Guildmage Harald, King of Skemfar High Perfect Morcant Izoni, Center of the Web Izoni, Thousand-Eyed Jarad, Golgari Lich Lord Kagha, Shadow Archdruid Korozda Guildmage Lathril, Blade of the Elves Llanowar Dead Lluwen, Exchange Student Lluwen, Imperfect Naturalist Morcant's Loyalist Nath of the Gilt-Leaf Ochran Assassin Poison-Tip Archer Rakish Scoundrel Savra, Queen of the Golgari Shaman of the Pack Shessra, Death's Whisper Stoic Grove-Guide Storrev, Devkarin Lich Swarm Guildmage Tribune of Rot Trystan's Command Twinblade Assassins Tyvar the Bellicose Underrealm Lich Wardens of the Cycle Winnowing Forces
Evasive rather than the meaningless on a 6-power dork deathtouch
Now go get your tribal on