Whatever it is you draw, you can play the best card you just drew for right now, and then do it again and again and again
However, now there are ways to have these abilities trigger that don't involve the planar die at all
Archangel Avacyn Arlinn Kord Arlinn, Embraced by the Moon Avacyn, Angel of Hope Avacyn, the Purifier Balefire Dragon Bloodline Keeper Brisela, Voice of Nightmares Chandra, Dressed to Kill Craterhoof Behemoth Cultivator Colossus Edgar Markov Emrakul, the Promised End Garruk Relentless Garruk, the Veil-Cursed Gisela, the Broken Blade Grimgrin, Corpse-Born Griselbrand Jace, Unraveler of Secrets Liliana of the Veil Lord of Lineage Mirrorwing Dragon Necroduality Olivia Voldaren Sigarda, Host of Herons Snapcaster Mage Sorin, Imperious Bloodlord Tamiyo, Field Researcher Temporal Mastery The Gitrog Monster The Meathook Massacre Through the Breach Wrenn and Seven
Its also banned in multiple formats due to how easy it is to win after casting it
This set holds good investor value and is worth it