Knock stuff off your desk so you dont have to
For two mana, the instant made it so target player couldn't cast instants, sorceries, or activated abilities requiring an activation cost
There are a lot of good rares, like Opposition Agent, mythics, like Jeweled Lotus, and also some very useful uncommons, like Cultivate

Academy Journeymage Acquisitions Expert Aegar, the Freezing Flame Allied Assault Angel of Unity Arcane Epiphany Archmage of Echoes Archpriest of Iona Ardent Electromancer Astrologian's Planisphere Azami, Lady of Scrolls Barrin, Master Wizard Base Camp Benthicore Black Mage's Rod Bloodline Necromancer Blue Mage's Cane Burakos, Party Leader Cascade Seer Champion of Wits Chilling Trap Circle of Power Coastal Wizard Commodore Guff Concerted Defense Cornered by Black Mages Coveted Prize Deadly Alliance Diviner's Wand Docent of Perfection Drana's Silencer Dreamstealer Emeria Captain Ertai, Wizard Adept Expedition Diviner Fever Charm Final Iteration Fissure Wizard Flame of Anor Frostpyre Arcanist Galecaster Colossus Gempalm Sorcerer Ghitu Journeymage Ghosthelm Courier Giant's Amulet Goblin Wizardry Great Hall of the Biblioplex Grotag Bug-Catcher Harmonic Prodigy Harper Recruiter Inalla, Archmage Ritualist Inalla, Archmage Ritualist Inspired Sprite Ixidor's Will Journey to Oblivion Jushi Apprentice Jushi Apprentice Kabira Outrider Kasmina, Enigmatic Mentor Kitsune Mystic Kitsune Mystic Kuja, Genome Sorcerer Lavamancer's Skill Lich Lord of Unx Lindblum, Industrial Regency Lindblum, Industrial Regency Mage's Attendant Malakir Blood-Priest Mana Sculpt Master of Winds Mentor's Guidance Multiclass Baldric

Shift: Pay the cost listed next to Shift to play this card on top of a card with the same name