Krosan Grip You could argue that split second was a mistake, but its role as a Disenchant that cant be responded to has made Krosan Grip a sideboard mainstay in Eternal formats ever since it was printed
The Ixalan block has a set of artifacts and enchantments that transform into lands
This can make it difficult to use them reactively in order to make opponents waste cards and mana while you protect your gameplan

A Premonition of Your Demise Aang, at the Crossroads Abaddon the Despoiler Abiding Grace Abrupt Decay Abundant Maw Accelerated Mutation Access Denied Ad Nauseam Adder-Staff Boggart Adipose Offspring Advice from the Fae Aether Vial Agadeem Occultist Agadeem's Awakening Against All Odds Airlift Chaplain Ajani, Adversary of Tyrants Ajani, Outland Chaperone Alaundo the Seer Alchemist's Talent Alesha, Who Laughs at Fate Aluren Amped Raptor Amrou Scout Amy's Home Amzu, Swarm's Hunger Analyze the Pollen Anchor to Reality Ancient Brass Dragon Ancient Cellarspawn Ancient Ooze Angel of Eternal Dawn Angel of Indemnity Angrath, the Flame-Chained Angry Rabble Animate Artifact Annex Sentry Annie Flash, the Veteran Anoint with Affliction Anrakyr the Traveller Anticausal Vestige Ao, the Dawn Sky Appetite for Brains Arcade Gannon Arcane Endeavor Arcane Proxy Arcanis, the Omnipotent Avatar Archangel Elspeth Archmage's Charm Arcum's Whistle Argentum Masticore Armor Wars Arni Metalbrow Artifact Mutation Artificer's Intuition Artillery Enthusiast As Foretold Ascend from Avernus Ascendant Packleader Ashiok, Nightmare Weaver Ashiok, Wicked Manipulator Ashling's Prerogative Ashling, Rimebound Astelli Reclaimer Augury Adept Aura Mutation Auriok Salvagers Austere Command Axebane Ferox Ayara, Widow of the Realm Ayesha Tanaka, Armorer

It particularly has a good selection of black cards that mages can slot into many different black Commander builds
Players should be free to open packs, craft cards, and purchase card styles without worrying about doing things "the right way." I get itif there's one thing Magic players love, it's learning to optimize their gameplay, but there shouldn't be an "optimal way" to bling out your deck