Intruder Alarm + Meloku the Clouded Mirror + Walking Atlas + any land the produces more than one mana = infinite tokens, infinite mana, and infinite landfall Mistform Ultimus equipped with Oathkeeper, Takeno's Daisho + combat damage from Wanderwine Prophets out = infinite turns Mistform Ultimus + Notorious Throng cast for its prowl cost + Archaeomancer with either Riptide Laboratory/Followed Footsteps/Conjurer's Closet = infinite turns Archaeomancer (on the board) + Rite of Replication + Turnabout = infinite dudes, mana, and any other instant/sorcery in your graveyard Archaeomancer + Deadeye Navigator + 7 or more land + Turnabout = infinite mana Archaeomancer + Riptide Laboratory + 11/12 more land + Turnabout = infinite mana Minion Reflector + Palinchron + 9 basics = infinite mana and dudes Aphetto Alchemist + Illusionist's Bracers = infinite untaps Archaeomancer + Tidespout Tyrant + Turnabout + 9 land = infinite mana Mischievous Quanar + Turnabout = infinite mana Ensoul Artifact + Voltaic Construct + artifact that adds more than 2 = infinite mana Amulet of Vigor + Patron of the Moon + Pearl Lake Ancient = infinite landfall and infinite mana Tezzeret the Seeker + The Chain Veil + any artifact that can tap for more than 4 = infinite planeswalker abilities Ghostly Flicker + Mnemonic Wall + Gilded Lotus + Arcane Melee = infinite storm and infinite mana Ashnod's Altar + Geralf's Mindcrusher + Sage of Fables = infinite card draw and infinite mill Teferi, Temporal Archmage as commander + The Chain Veil = infinite mana, infinite planeswalker abilities, and infinite draw

This means it can also be used to block your opponent from using a combo-piece they've tutor with vampiric tutor or enlightened tutor
If that card's mana value is less than or equal to the number of experience counters you have, return it to the battlefield
Lets go over each and every sideboard card to understand what makes those 15 cards so special
Witch of the Moors This is the best witch art, hands down