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My pick for 2016 is Shadows over Innistrad

2021-03-19 "Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack." 2021-03-19 A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way

Staples Kiki-Jiki, Mirror-Breaker Recoup This ones pretty contextual, but its hard to imagine a deck that cant take significant advantage of it

However, the second Attack, Calamity Storm which has the exact same cost as Frenzied Gouging in terms of energy is a great backup plan if you dont need to risk your HP