The Reserved list is a list of cards that Wizards of the Coast committed to never reprint
Its incredibly versatile
Card Text: Whenever one or more creatures a player control deals combat damage to you, that player take the initiative
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Synthoids Acquisition Octopus Adaptive Automaton Adaptive Gemguard Aerial Doombot Aesthir Glider Aetherjacket Alibou, Ancient Witness Alibou, Ancient Witness Alloy Myr Amaranthine Wall Ambulatory Edifice Ancestral Statue Angel of the Ruins Annex Sentry Anvilwrought Raptor Arabella, Abandoned Doll Arcane Proxy Arcanist's Owl Arcbound Condor Arcbound Ravager Argentum Masticore Argivian Avenger Armguard Familiar Arnim Zola, Bio-Fanatic Artificer's Dragon Ashnod's Harvester Atraxa's Skitterfang Attack-in-the-Box Attentive Sunscribe Automated Artificer Autonomous Assembler Awakened Amalgam Barbed Servitor Barkform Harvester Barricade Breaker Bastion Mastodon Biblioplex Assistant Biblioplex Tomekeeper Big Mother Mouser Blade of the Oni Bladecoil Serpent Blitz Automaton Blood Servitor Bloodline Pretender Bomat Courier Bonded Construct Boulderborn Dragon Boulderbranch Golem Breya, Etherium Shaper Brightglass Gearhulk Brimstone Trebuchet Bronze Walrus Bronzeplate Boar Brudiclad, Telchor Engineer Burnished Hart Buzz Bots Bygone Colossus Camera Launcher Campus Guide Cartographer's Companion Cataclysmic Gearhulk Cephalopod Sentry Chainflail Centipede Chamber Sentry Chardalyn Dragon Chief of the Foundry Chrome Cat Chrome Companion Chrome Dome Chrome Prowler

This is a far more powerful effect as it effectively can shut an opponent out of counters and responses, while decimating their hand and denying them options to fix it
Our other preview card, Vodalian Mindsinger, is sure to make many a merfolk fan happy