To make the game fairer to players who dont use such cards, MTG Arena restricts players to seven cards in their sideboard when playing best-of-one matches
I guess we will find out eventually
Tired of compromising the protection of your beloved Pokmon, Magic The Gathering, and Yugi-Oh cards? Look no further
Angler's Shield Armorcraft Judge Become the Avalanche Biorganic Carapace Blessing of Frost Cloud, Ex-SOLDIER Collective Unconscious Duskana, the Rage Mother Freyalise, Llanowar's Fury Gamma Grotesque Goliath, Mass Manipulator Heirloom Epic Infinite Guideline Station Inspiring Call Mouth // Feed Mouth // Feed Night of the Flying Merfolk (playtest) Plagon, Lord of the Beach Pol Jamaar, Illusionist Regal Force Shaman of the Great Hunt Shamanic Revelation Slate of Ancestry The Horus Heresy Tishana, Voice of Thunder Titan of Littjara Titan of Littjara Vivien's Stampede Voja, Jaws of the Conclave Winged Portent
The remaining few require some form of hoop jumping like with Oblation (shuffling a permanent into your library), Bennie Bracks (making tokens), and Halo Fountain (paying mana and untapping two untapped creatures)
Led by Disa the Restless, this Jund deck wants you to pop Lhurgoyfs into your grave, then resurrect them with your commander's ability