Experimenting with mana doubling on a 2-drop is dangerous territory, and I find it unwise that this card was printed as it is
Yes, since battles are permanents with counters on them, can absolutely proliferate those counters if you want to
Features the classic full-color artwork Magic: The Gathering card back artwork

Aang's Iceberg Advice from the Fae Aethershield Artificer Agrus Kos, Spirit of Justice Alchemist's Apprentice Altanak, the Thrice-Called Ambulatory Edifice Angelic Voices Apprentice Necromancer Apprentice Sharpshooter Apprentice Sorcerer Apprentice Wizard Archon of Justice Arlinn, Voice of the Pack Armistice Armory Mice Arrows of Justice Artificer Class Artificer's Assistant Artificer's Dragon Artificer's Epiphany Artificer's Hex Artificer's Intuition Atraxa, Praetors' Voice Aurelia, Exemplar of Justice Automated Artificer Avarice Amulet Avarice Totem Betor, Ancestor's Voice Bilbo's Deadly Slice Blade Splicer Blood Price Break the Ice Breya's Apprentice Brisela, Voice of Nightmares Chalice of Death Chalice of Life Chalice of the Void Chandra, Novice Pyromancer Checkpoint Officer Choice of Damnations Choice of Fortunes Cid, Timeless Artificer Cockatrice Cowardice Daring Apprentice Dark Depths Darksteel Splicer Deathgaze Cockatrice Decree of Justice Dennick, Pious Apprentice Disciple of Malice Disorienting Choice Dispense Justice Dissection Practice Dowsing Device Duplication Device Eccentric Apprentice Edifice of Authority Encase in Ice Enlistment Officer Epicenter Eutropia the Twice-Favored Evereth, Viceroy of Plunder Everflowing Chalice Evincar's Justice Ezio, Brash Novice Fiery Justice Fire // Ice Fire // Ice Flaming Fist Officer Flare of Malice

Necrotic Fumes, Academic Probation, and Containment Breach saw some play alongside Learn cards like Sparring Regimen and Eyetwitch, but there was one pairing that saw a lot of play: Divide by Zero and Mascot Exhibition