Improvise is one of the most underplayed mechanics in Standard in my opinion, and I think Karn is going to change that in the upcoming Standard format
Hightide Hermit: [Category 2] ETB yield is 4 Energy for 5 mana, then you can spend 2 Energy to undo the Defender limitation
Adric, Mathematical Genius Aerial Engineer Aeronaut Tinkerer Aether Chaser Aether Herder Aether Inspector Aether Poisoner Aether Swooper Aethershield Artificer Afterburner Expert Al Bhed Salvagers Alicia Masters, Skilled Sculptor Ambitious Aetherborn Arbalest Engineers Architect of the Untamed Arcum Dagsson Argivian Archaeologist Argivian Blacksmith Armorcraft Judge Ashnod the Uncaring Ashnod, Flesh Mechanist Aspiring Aeronaut Audacious Reshapers Automated Artificer Aviary Mechanic Aviation Pioneer Axgard Artisan Ayesha Tanaka Ayesha Tanaka, Armorer Bastion Inventor Battery Bearer Beamsaw Prospector Biomechan Engineer Blade Splicer Boomstacker Brenard, Ginger Sculptor Breya's Apprentice Brotherhood Scribe Brudiclad, Telchor Engineer Carapace Forger Cayth, Famed Mechanist Chief Engineer Cid, Timeless Artificer Clamavus Cloudsculpt Technician Countless Gears Renegade Cultivator of Blades Curator of Sun's Creation Cybernetica Datasmith Dalakos, Crafter of Wonders Daretti, Rocketeer Engineer Daring Archaeologist Daring Mechanic Darksteel Splicer Dauntless Dismantler Defiant Salvager Digsite Engineer Diligent Excavator Dispersal Technician Doomed Artisan Draconautics Engineer Drafna, Founder of Lat-Nam Dwarven Weaponsmith Edgar, King of Figaro Edgar, Master Machinist Elegant Edgecrafters Elvish Archivist Embersmith Enthusiastic Mechanaut Erebor Flamesmith Etherium Sculptor Experimental Aviator
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Then the uncommon costs three for a 2/1 size and warp too with an ETB ability you can get twice to dig two, draw one and bin the other
