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(ran out of gas, mana screwed, wiped twice, combo raced, etc.) Which cards felt dead in hand

Aang and Katara Abaddon the Despoiler Abandon Hope Aberrant Aberrant Manawurm Abian, Luvion Usurper (playtest) Abuelo's Awakening Abzan Monument Academy Elite Accelerated Mutation Access Denied Accessories to Murder Accomplished Alchemist Acolyte's Reward Acornelia, Fashionable Filcher Adipose Offspring Aeon Chronicler Aerith Gainsborough Aether Refinery Aettir and Priwen Agadeem's Awakening Agatha of the Vile Cauldron Aggressive Biomancy Agility Bobblehead Ajani, Caller of the Pride Ajani, Outland Chaperone Ajani, Valiant Protector Ajani, Wise Counselor Akroan Hoplite Alabaster Potion Aladdin's Lamp Alandra, Sky Dreamer Alexander Clamilton Alexi, Zephyr Mage Alibou, Ancient Witness Alibou, Ancient Witness Alistair, the Brigadier All-Fates Scroll All-Seeing Arbiter Alliance of Arms Allied Assault Alpine Houndmaster Alquist Proft, Master Sleuth Altar of the Goyf Altar of the Wretched Altered Ego Ambitious Dragonborn An Unexpected Party An-Havva Inn Ancestral Anger Ancient Brass Dragon Ancient Bronze Dragon Angelic Exaltation Anim Pakal, Thousandth Moon Animist's Awakening Animus of Night's Reach Another Round Antarctic Research Base Anthroplasm Anzrag's Rampage Apocalypse Hydra Apothecary White Appeal // Authority Appeal // Authority Arabella, Abandoned Doll Arachnogenesis Arahbo, Roar of the World Arashi, the Sky Asunder Arbor Adherent Arboreal Alliance Arcane Omens Arcanis, the Omnipotent Avatar

Paired with power-dependent sweepers like Fell the Mighty, Terra Ravager can clear an opponent out quickly
Additionally, participating game stores will be hosting Magic Academy events where you can learn to play with these Welcome Decks
Hazel's Brewmaster reminds me of Deathbonnet Sprout / Deathbonnet Hulks back side, though its an attack trigger that makes Food tokens instead of an upkeep trigger