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Slickshot Show-Off If I had to pick one card to extricate from the Standard format to make it better, Slickshot Show-Off would be my choice (though it's not the most hated card)

How Do I Find The Kristoff Promo Card

It attacks well, it blocks well, and it keeps you in the race via Lifelink

The three mana isnt so curve-friendly, but you can deal damage to any target, you can proliferate, and it's an instant

They serve to give your side of the board tempo by allowing your creatures to attack (removing defenders), giving you more time to set up the board (removing attackers/expensive creatures), and allow for combat tricks (saving your creatures after damage is on the stack