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Rivaz is about as good a support card as you can get for a Dragon deck

While their strongest identity comes from Innistrad, where theyre all about flash and tempo and the like, most planes have a spirit or two

The Phantom Knight of Torn Scales Tri-Brigade Fraktall Virtual World Roshi Laolao Lyrilusc Cobalt Sparrow Prank-Kids Rocksies Adamancipator Analyzer Water Enchantress of the Temple (new) Spells Scapegoat Sekkas Light Super Polymerization The Beginning of the End Emergency Teleport Mask Change II Magical Meltdown Called by the Grave Sky Striker Mobilize Engage

If you want to shut down the taking of extra turns, which I do think is in bounds as way to stop someone from walking down the infinite path of extra turns, then might I suggest Ugin's Nexus instead