Each one has a trigger for when the Ring tempts you, and each has a separate enters the battlefield trigger that causes the Ring to tempt you
Dockside Extortionist Emrakul, the Aeons Torn Erayo, Soratami Ascendant Golos, Tireless Pilgrim Griselbrand Hullbreacher Iona, Shield of Emeria Leovold, Emissary of Trest Nadu, Winged Wisdom Pradesh Gypsies Primeval Titan Primeval Titan Prophet of Kruphix Rofellos, Llanowar Emissary Stone-Throwing Devils Sundering Titan Sylvan Primordial Tempest Efreet Timmerian Fiends
Daretti, Ingenious Iconoclast: Another great design
True, it requires four energy so you'll need to deploy ramp cards like Magby to make it work, but it's still double what Mega Venusaur dishes out - and for the same cost
Twenty and Done Mark's Top 20 includes several other cards, like Mirage charms (leading to modal spells), Figure of Destiny (leading to progression cards), Force of Will (forefather of one of Magic's most broken mechanics, free spells), shock lands, and creature lands
They just love Raqyuaza