For two mana it provides a card filtering option, allowing you to discard and then draw a card each time you cast a spell if you choose

A Good Thing (playtest) A Killer Among Us A Little Chat A Most Helpful Weaver A Trail of Teacups Aang's Iceberg Abandoned Outpost Abhorrent Overlord Abjure Aboroth Abstruse Interference Abzan Banner Abzan Monument Accursed Centaur Ace, Fearless Rebel Acidic Dagger Acidic Sliver Acolyte of Aclazotz Acridian Ademi of the Silkchutes Adric, Mathematical Genius Adverse Conditions Aeolipile Aerial Toastmaster Aerie Ouphes Aether Spellbomb Aetherjacket Afiya Grove Aftermath Analyst Agatha's Champion Age of Ultron Agency Coroner Agent 13, Sharon Carter Agent of Shauku Agent's Toolkit Aggressive Mining Ahn-Crop Invader Ahriman Ainok Strike Leader Air Nomad Legacy Airdrop Condor Airship Engine Room Ajani Fells the Godsire Ajani's Aid Ajani's Last Stand Akki Avalanchers Akki Scrapchomper Akul the Unrepentant Akuta, Born of Ash Albino Troll Alchemist's Apprentice Alchemist's Talent Alchemist's Vial All-Fates Scroll Ally Encampment Alpine Guide Alquist Proft, Master Sleuth Alseid of Life's Bounty Altar of Bone Altar of Dementia Altar of the Wretched Altar's Reap Amateur Auteur Ambush Commander Amphin Mutineer Amulet of Quoz An Offer You Can't Refuse An Unearthly Child Ancestors' Aid Ancestral Carvings Ancestral Knowledge Anchor to Reality

The Mana Rig The Mana Rig churns out Powerstone tokens whenever you cast multicolored spells to give you extra fuel for artifacts or activated abilities
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Hope Estheim I havent stopped thinking of Hope Estheim since I saw it spoiled
It may be harder to cast but overall serves the same function