Legacy's Allure was a decent way of getting some nice early tempo and disruption on the aggressive decks that wasn't dead in other matchups quite as much as most other hoser cards are
Use this in tandem with a Thraben Inspector to create a near endless supply of Clue tokens and ensure that you never run out of cards in hand
But the overwhelming majority of counter decks focus on +1/+1 counters, with an endless wave of support for the archetype

$64.99 Cloud, Midgar Mercenary (0375 - Borderless) Final Fantasy Variants $79.99 Sephiroth, Fabled SOLDIER (0382 - Borderless) Final Fantasy Variants $39.99 Tifa, Martial Artist (0206 - Borderless) Final Fantasy Commander Decks Variants $109.99 Buster Sword (0351 - Borderless) Final Fantasy Variants $32.99 Tidus, Yuna's Guardian (0205 - Borderless) Final Fantasy Commander Decks Variants $42.99 Celes, Rune Knight (0201 - Borderless) Final Fantasy Commander Decks Variants $59.99 Yuna, Grand Summoner (0208 - Borderless) Final Fantasy Commander Decks Variants $64.99 Terra, Herald of Hope (0204 - Borderless) Final Fantasy Commander Decks Variants $99.99 Sephiroth, Fabled SOLDIER (0317 - Borderless) Final Fantasy Variants $199.99 Y'shtola, Night's Blessed (0207 - Borderless) Final Fantasy Commander Decks Variants $0.59 Barret, Avalanche Leader (0166 - Extended Art) Final Fantasy Commander Decks Variants $15.99 Tifa Lockhart (0391 - Borderless) Final Fantasy Variants 0 results found

Hydroid Krasis Strengths: Exiles, answers planeswalkers Weaknesses: Experimental Frenzy, Adanto Vanguard, Ripjaw Raptor Strengths: Instant-speed, answers planeswalkers Weaknesses: Rotting Regisaur, Marauding Raptor, Sanctum Seeker All three of these cards are narrow but quite powerful, which makes them great sideboard options
Elspeth, Sun's Champion is a very versatile win condition in many Cubes, EDH decks, and some Pioneer decks