Regarding Iona, it's simple: Any reanimator deck, anything with Kaalia of the Vast, any GW deck with something like Natural Order, hell, any deck with Deathrender, frankly couldn't care less about the mana cost.
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Card advantage is not the same thing as card draw. Something for 2B cannot be strictly worse than something for BBB or 3BB. If you're taking out Swords to Plowshares for Plummet, you're a fool. Stop doing these things!
That's actually pretty fair.
Regarding Iona, it's simple: Any reanimator deck, anything with Kaalia of the Vast, any GW deck with something like Natural Order, hell, any deck with Deathrender, frankly couldn't care less about the mana cost.
On phasing: