Overcharged Amalgam has all of this and more: its exploit ability is an instant-speed sacrifice outlet, and it gets around cards like Negate and Dovins Veto
This is the kind of card that affords enough swing in the game to stop you dying and allow you to cheat out another thing which combined with the Primus will be enough to win
It virtually always tacks a colossal downside onto a card, and most of the cards with it cant be good because of it
Thanks again, Dorian and Mike
Avacyn does cost a lot of mana to cast, so it'll take a bit to get enough mana to cast it, but once you do, it'll be hard to ever get rid of
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