If you cast a spell that targets this creature multiple times, this ability triggers just once
Its powerful construction can produce results quickly in competitive games
it reads like a sacrifice payoff (and it is), but blue doesnt offer as many homes for an aristocrats-style card outside maybe Kels, Fight Fixer or Anhelo, the Painter

Aesi, Tyrant of Gyre Strait Benthic Anomaly Benthic Behemoth Biolume Egg Biolume Serpent Bladecoil Serpent Bog 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 Lava Serpent Lightning 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

Honorable Mentions Voidmage Prodigy A revelatory card upon release, as well as Magic Hall of Famer Kai Buddes Invitational card, this Wizard lord turns all of your Wizards into walking Counterspells (the capitalization is merited, as the activation cost for the ability is double blue
1 Traditional Foil Jurassic World Card (Rare or Land)