Crawlspace, Silent Arbiter and Dueling Grounds all restrict the number of creatures that can attack and do so without breaking the bank
In the case where the target creature is copying something else when Echoing Assault's second ability resolves, then the token enters as whatever that creature copied, except it's a 1/1
Vnwxts Jet Fuel Vnwxt, Verbose Host | Illustration by Chris Seaman Commander (1) Planeswalker (2) Jace, Wielder of Mysteries Teferi, Temporal Pilgrim Creature (26) Faerie Seer Gudul Lurker Illvoi Galeblade Mist-Cloaked Herald Siren Stormtamer Slither Blade Spectral Sailor Triton Shorestalker Emrakul's Messenger Faerie Mastermind Malcolm, Alluring Scoundrel Mischievous Mystic Shoreline Looter Silent Hallcreeper Triskaidekaphile Chasm Skulker Laboratory Maniac Minn, Wily Illusionist Clinquant Skymage Homunculus Horde Oneirophage Twenty-Toed Toad Alandra, Sky Dreamer Enduring Curiosity Psychosis Crawler Body of Knowledge Sorcery (3) Instant (14) An Offer You Can't Refuse Brainstorm High Tide Opt Pongify Rapid Hybridization Arcane Denial Negate Reality Shift Tolarian Winds Counterspell Brainsurge Frantic Search Aetherize Enchantment (7) Wizard Class Ominous Seas Proft's Eidetic Memory Propaganda Coastal Piracy Reconnaissance Mission Teferi's Ageless Insight Artifact (10) Sol Ring Arcane Signet Mind Stone Sapphire Medallion Thought Vessel Midnight Clock Thopter Fabricator Aether Syphon Racers' Scoreboard Bident of Thassa Land (37) Amonkhet Raceway Avishkar Raceway Island x32 Muraganda Raceway Mystic Sanctuary Reliquary Tower The idea of this deck is to turn a tiny homunculus into a full-blown chaos engine by maximizing its max speed ability that doubles card draw
Ruric Thar, the Unbowed Ruric Thar, the Unbowed dies to Doom Blade, but doing so costs 6 life
Cyberdark Dragon X DARK Level 8 [ Machine / FusionEffect ] ATK 1000 DEF 1000 "Cyberdark Horn" + "Cyberdark Edge" + "Cyberdark Keel" Must be Fusion Summoned
