You can still activate this effect while Necrovalley is on the field, but you can only Special ecial Summon a Tuner monster from your hand

35 Lands 11 Ramp : Sol Ring, Arcane Signet, Patchwork Banner, Dimir Signet, Orzhov Signet, Rooftop Storm, Undead Warchief, Bontus Monument, Talisman of Dominance, Talisman of Hierarchy, Crowded Crypt 9 Target Removal :Flip the Switch, Feed the Swarm, Overcharged Amalgam, Grimgrin, Corpse-Born, Invasion of New Capenna, Murderous Rider, Kabira Takedown, Hagra Mauling, Jwari Disruption 4 Board Wipes :Nevinyrral, Urborg Tyrant, Noxious Ghoul, Archfiend of Ifnir, Zombie Apocalypse (Humans only) 11 Graveyard Recursion : Cursecloth Wrappings, Zul Ashur, Lich Lord, Zombie Apocalypse, Lost Monarch of Ifnir, The Scarab God, Rot Hulk, Unholy Grotto (to top of library), Murderous Rider (self-recursion), Rise of the Dark Realms, God-Eternal Oketra (self-recursion), Sidisi, Regent of the Mire 4 Graveyard Hate : Necromancers Covenant, Bojuka Bog, The Scarab God, Cemetery Reaper 1 Tutor : Waterlogged Teachings 10 Protection : Raffine, Scheming Seer (Ward), Zul Ashur, Lich Lord(Ward), Zombie Master, Gleaming Overseer, Ratadrabik of Urborg (Ward), Nevinyrral, Urborg Tyrant (self-protection), Accursed Duneyard, Jwari Disruption, Overcharged Amalgam, Flip the Switch 16 Card Draw : Temmet, Naktamuns Will, Raffine, Scheming Seer, Graveborn Muse, Hordewing Skaab, Windfall, Brainstorm, Frantic Search, Distant Melody, Tolarian Winds, Undead Augur, Prophet of the Scarab, Cryptbreaker, Forgotten Creation, Spymasters Vault, Varina, Lich Queen, Midnight Reaper 6 Finishers/ Surprise /Alternate win conditions : Temmet, Naktamuns Will, The Scarab God, Rise of the Dark Realms Zombie Apocalypse, Grimgrin, Corpse-Born, Acererak the Archlich As we see form the comparative analysis, the rates per category are very good

Other than in a Gates deck, I dont think you want this card
Counter Traps & Others Unlike Floodgates, Counter Traps are a one and done kind of disruption
Attack!", followed by "Cosmic Flare!" When Akiza activates that monster's Quick Effect, she announces "Please use your effect to help me, Stardust Dragon!", followed by "Victim's Sanctuary!" When Akiza activates that monster's Trigger Effect, she announces "Stardust Dragon's effect returns it to my field!" When Akiza Summons "Blue Rose Dragon", she announces "I Summon Blue Rose Dragon!" Most of the time when Akiza attacks with that monster, she announces "Blue Rose Dragon