Along with getting absolutely demolished by the Emerald & Sapphire Starter Deck (which Ill speak to in a moment), I just never felt like I had the cards I needed to answer problems as they arose
While the Hydra Avatar has gone down a good deal in terms of power - which is really strange to say - it's still a card with a tremendous amount of presence, and hey, it's now Standard legal as well for the next five years thanks to Foundations

3 Harpie Perfumer 3 Harpie Harpist 3 Harpie Channeler 1 Harpie Oracle 2 Harpie Dancer 3 Harpie Lady 1 1 Harpie Queen 1 Harpie Lady Sisters 1 Harpies Pet Dragon 2 Performapal Sky Magician 3 Elegant Egotist 1 Harpies Feather Duster 2 Harpies Feather Rest 1 Alluring Mirror Split 3 Hysteric Sign 1 Harpies Hunting Ground 1 Magicians Right Hand 1 Magicians Left Hand 3 Harpies Feather Storm 1 Harpie Lady Elegance 1 Hysteric Party 2 Back to the Front 2 Harpie Conductor 2 Cyber Slash Harpie Lady 2 Harpies Pet Phantasmal Dragon 1 Number 11: Big Eye 1 Number S39: Utopia the Lightning 1 Number 39: Utopia 1 Number F0: Utopic Future Dragon 1 Number F0: Utopic Future 1 Tornado Dragon 1 Castel, the Skyblaster Musketeer 1 Lightning Chidori 1 Drill Driver Vespenato Deck 2: Harpie + Dragunity Deck Use Harpies as Link Material for Dragunity Knight Romulus

Both of those cards untap permanents in general which includes lands, creatures, enchantments, artifacts, and even planeswalkers, but many cards specialize in specific permanent types
How Can You Play Cards from Exile