Because devoid cards still have mana symbols on them, those symbols are used to determine the cards color identity
Chandras Regulator This is an auto-include if youre running a bunch of Chandras, but the repeated rummaging is good on its own
Irreverent Gremlin's second ability checks the power of the other creature only at the moment that creature enters
Other cards are needed to help out

Calculated Dismissal Cascade Seer Catch of the Day (playtest) Cavalier of Gales Chain to Memory Chorus of the Tides Cloudreader Sphinx Condescend Contact Other Plane Council's Deliberation Cryptic Annelid Curator of Mysteries Deliberate Delightful Discovery Denethor, Stone Seer Desynchronize Dissolve Diviner's Portent Djinn of the Fountain Djinni Windseer Eligeth, Crossroads Augur Elrond, Lord of Rivendell Elvish Mariner Eye of Malcator Eyes Everywhere Eyes of the Watcher Fading Hope Faerie Seer Fated Infatuation Foresee Freeze in Place Gadwick's First Duel Geist of the Archives Glimmer of Genius Glistener Seer Goggles of Night Graven Lore Grey Havens Navigator Hakka, Whispering Raven Hedron Alignment Hermes, Overseer of Elpis Hithlain Knots Horizon Scholar Horses of the Bruinen Impede Momentum Inga Rune-Eyes Ingenious Mastery Inscription of Insight Interpret the Signs Jace's Defeat Jace's Sanctum Jace, Mirror Mage Jace, Unraveler of Secrets Joint Exploration

Plus, three toughness is somehow outrageous in Pioneer because every red deck plays Wild Slash and Shock instead of Fiery Impulse