Aang, Swift Savior Abhorrent Oculus Abstract Performance Abuelo, Ancestral Echo Admiral Brass, Unsinkable Aegis Sculptor Aerial Caravan Agent of Kotis Agent of Raffine Alaundo the Seer Alberix, the Trade Planet (playtest) Alrund's Epiphany Alrund, God of the Cosmos Alter Reality Aminatou's Augury Aminatou, the Fateshifter Amphin Mutineer Ancestral Knowledge Ancestral Vision Animate Library Aquatic Alchemist Aquatic Alchemist Arala, Hedron Scaler Araumi of the Dead Tide Arcane Artisan Arcane Heist Arcane Infusion Arcane Savant Archive Haunt Archmage's Newt Ardent Plea Argent Sphinx Artful Dodge Ashiok's Erasure Ashiok, Dream Render Ashiok, Nightmare Muse Ashiok, Nightmare Weaver Assert Authority Assimilation Aegis Augury Raven Auton Soldier Aven Initiate Aven Wind Guide Azula, Cunning Usurper Baboon Spirit Back from the Brink Bane Alley Broker Bazaar of Wonders Beacon Bolt Become Anonymous Beetle, Legacy Criminal Behind the Mask Behold the Multiverse Behold the Unspeakable Beluna's Gatekeeper Beluna's Gatekeeper Benevolent Geist Blessed Reincarnation Blizzard Strix Blue Mage's Cane Blur Bond of Insight Bound // Determined Brackwater Elemental Brago, King Eternal Brenard, Ginger Sculptor Brilliant Ultimatum Brinebound Gift Bring to Light Broken Concentration Brokers' Safeguard Broodbirth Viper

I obviously recommend having one whenever you can, since theres no downside to having one
Paying just one mana to instantly remove a creature from play is nice
In addition to serving as a powerful card advantage engine, Rielle doubles as a nasty threat
Birgi, God of Storytelling Getting mana for casting spells and saving mana between phases are already really powerful things to be doing in Magic, and Birgi, God of Storytelling does even more
For cards that were once legal but are too old for Modern or that were banned long ago, this comparison isnt all that hard