No player votes until the spell or ability resolves
Day's Undoing and Sundial of the Infinite are the only cards from the list where the end the turn effect cant be used to end your opponents turn under normal circumstances
Now you refer to exile. Its been in every set (in some form) since the start of the game and expect it to remain
In Yugioh Online, the level did not mean anything
Aesi, Tyrant of Gyre Strait Benthic Anomaly Benthic Behemoth Biolume Egg Biolume Serpent Caetus, Sea Tyrant of Segovia Cryptic Serpent Deep-Sea Serpent Deep-Sea Terror Denizen of the Deep Dirgur Nemesis Dreamwinder Floodtide Serpent Frilled Sea Serpent Gearseeker Serpent Harbor Serpent Iceridge Serpent Junk Winder Koma, Cosmos Serpent Koma, Cosmos Serpent Koma, World-Eater Kukemssa Serpent Loch Mare Lochmere Serpent Marjhan River Serpent Ronom Serpent Sandbar Serpent Scrapdiver Serpent Sea Monster Sea Serpent Serpent of Yawning Depths Serpent of the Endless Sea Serpent of the Pass Shoal Serpent Shrouded Serpent Slinking Serpent Slipstream Serpent Sliptide Serpent Spire Serpent Steelclad Serpent Striped Riverwinder Sword Coast Serpent Taniwha The Terror of Serpent's Pass The Unagi of Kyoshi Island Tolarian Serpent Tolarian Terror Verazol, the Split Current Vodalian Serpent Wormhole Serpent Xolatoyac, the Smiling Flood Yorion, Sky Nomad

Firstly, heres how its summoned: you can banish 3 monsters (either Light, Dark, or a mix of the two) to summon this card