The deck can hit as fast and hard as Mono Red against control while also having the removal for creature-heavy decks
It doesnt come up that often, but it does come up more often than using Arcane Denial on your own spellusing two cards to get three cards is trading a resource (cards) for the same resource (cards), which makes it not that exciting, while trading between resourcesfrom cards to mana, is more likely to get you something you need
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As mythic rares, these cards are going to be difficult to pack anyway, but these variants are likely to be highly sought after once the set launches, not just for the value a complete set of the elder dragon cards may hold, but also for their eligibility as Commanders
Im also only considering cards that reduce the cost of other spells, not cards that reduce their own casting cost