Those abilities are a good fit, since Mizzix wants to head up a deck that has a lot of different mana costs (so you can climb the stairs to accrue experience), but also a lot of big mana costs, so you benefit from her cost-saving genius
1 Farhaven Elf
to your leader or a second character
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Abattoir Ghoul Aegar, the Freezing Flame Aegis of the Legion Agent's Toolkit Angelheart Vial Anowon, the Ruin Thief Apex Altisaur Arcbond Archangel of Thune Archangel of Thune Archon of Sun's Grace Auntie's Snitch Aurora Eidolon Axelrod Gunnarson Backfire Barbed Servitor Baron Sengir Bellowing Aegisaur Binding Agony Black Panther, Claws of Bast Black Panther, Hope Enduring Black Panther, Most Dangerous Blazing Sunsteel Blessed Sanctuary Bloated Contaminator Blood Cultist Blood Hound Bloodlord of Vaasgoth Bloodroot Apothecary Body of Knowledge Bogardan Lancer Boros Mastiff Boros Reckoner Brash Taunter Broodhatch Nantuko Bushi Tenderfoot Cacophodon Captain America, Steve Rogers Cephalid Constable Cephalid Illusionist Chandra's Incinerator Chandra's Phoenix Chandra's Spitfire Chandra, Fire of Kaladesh Changeling Hero Coalhauler Swine Contested Game Ball Crag Saurian Crossway Troublemakers Darien, King of Kjeldor Daybreak Coronet Death Pits of Rath Deep-Slumber Titan Deftblade Elite Desmond Miles Diseased Vermin Donna Noble Dread Slaver Drogskol Reaver Drogskol Reinforcements Dromad Purebred Druid's Call Estinien Varlineau Eternal Thirst Expedited Inheritance Ezio Auditore da Firenze Faithful Squire Faithful Squire Fall of Cair Andros Family's Favor Favored Hoplite Feldon, Ronom Excavator

She's only an indestructible enchantment until your devotion to red and green is seven, at which point she also becomes a 4/5 creature
Attendees of these receive the unique prerelease pack