I also hope that, as youre organizing your collection, you remember the good times youve had playing Magic and look forward to the games youll play in the future
Barring Riftsweeper, Misthollow Griffin, or the actual commander, you can take out virtually anything

Scientists Abandon Hope Abian, Luvion Usurper (playtest) Abolish Absorb Vis Academic Dispute Academy at Tolaria West Acceptable Losses Akroma's Blessing Akroma's Vengeance Alabaster Host Intercessor Alberix, the Trade Planet (playtest) Alexi, Zephyr Mage Amber Gristle O'Maul Amugaba Ancestral Memories Ancient Excavation Angel of the Ruins Anje's Ravager Anurid Brushhopper Anvil of Bogardan Apocalypse Aquamoeba Arc Mage Arcane Subtraction Arm-Mounted Anchor Arrogant Wurm Artificer's Intuition Artillery Enthusiast Ash Barrens Astonishing Spider-Man Asylum Visitor Atemsis, All-Seeing Attunement Aura Extraction Avaricious Dragon Aven Trooper Avenger en-Dal Awaken the Honored Dead Backslide Bag of Holding Balamb T-Rexaur Balance Balduvian Horde Balloon Peddler Balshan Griffin Bandit's Talent Barbarian Bully Barkhide Mauler Barren Moor Basking Rootwalla Battle Plan Battlewing Mystic Bazaar of Baghdad Bebop, Warthog Warrior Bedhead Beastie Bedlam Reveler Behold the Beyond Binding Negotiation Blasted Landscape Blaster Mage Bloated Toad Blood Fountain Blood for the Blood God

You can use it as a sort of Eerie Interlude to protect a group of creatures or just reuse their ETBs
If you cascade into a counterspell, you can cast that spell the same as you would any other cascaded spell