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Sauron's "enter the battlefield" effect is a classic Threaten effect, taking control of an opponent's creature, untapping it, and giving it haste until end of turn
So, stack up enough energies on this sucker before letting rip, and you'll be able to freeze just about anything
But you get to keep your hand knowing that youll be losing a land, while your opponent doesnt have that foresight
Glacial Crevasses is useless unless you happen to be playing snow
It then has me proliferate, which may not help with everything counters, but it still should serve as something of a backup for Heroic Intervention