Feather is incredibly tough to deal with, especially when cards like Boros Charm and Blacksmith's Skill start giving her indestructible and/or hexproof
One of the best cards in Tournament Pack 8 is the super rare printing of Harpies Feather Duster
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(You can't use more than 1 GX attack in a game.) Card Number: 129/236 Card Type: Darkness Finish: Holo HP: 200 Name: Alolan Persian GX Rarity: Ultra Rare Resistance: Psychic Retreat Cost: 2 Set: Sun & Moon - Cosmic Eclipse Stage: Stage 1 Weakness: Fighting Related Products Excadrill - 115/236 - Holo Rare Sun & Moon - Cosmic Eclipse Near Mint 1 In Stock Near Mint 1 In Stock Near Mint 1 In Stock Jangmo-o - 160/236 - Common Sun & Moon - Cosmic Eclipse Lightly Played 1 In Stock Lightly Played 1 In Stock Lightly Played 1 In Stock Braviary - 178/236 - Rare - Reverse Holo Sun & Moon - Cosmic Eclipse Lightly Played 1 In Stock Lightly Played 1 In Stock Lightly Played 1 In Stock Marshadow - 103/236 - Rare - Reverse Holo Sun & Moon - Cosmic Eclipse Near Mint 1 In Stock Near Mint 1 In Stock Near Mint 1 In Stock Eevee - 167/236 - Common Sun & Moon - Cosmic Eclipse Moderately Played 1 In Stock Moderately Played 1 In Stock Moderately Played 1 In Stock Pyroar - 37/236 - Uncommon - Reverse Holo Sun & Moon - Cosmic Eclipse Near Mint 1 In Stock Near Mint 1 In Stock Near Mint 1 In Stock Roller Skater - 203/236 - Uncommon - Reverse Holo Sun & Moon - Cosmic Eclipse Near Mint 1 In Stock Near Mint 1 In Stock Near Mint 1 In Stock Igglybuff - 168/236 - Uncommon Sun & Moon - Cosmic Eclipse Near Mint 12 In Stock Near Mint 12 In Stock Near Mint 12 In Stock Lightly Played 2 In Stock

You can trade in extra copies for flairs, which are special effects for your cards
There's nothing more devastating than having your Blue-Eyes turned against you, so it's best to have this card on your side rather than your opponent's