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While this one does present the risk of languishing in your hand for some time, you still get three modes that can get you out of trouble, because countering instants will often mean protecting a key creature on your side of the board from a removal spell

Lobelia, Defender of Bad End Although its a risky play, Lobelia, Defender of Bag End could give you some very powerful cards at a very low cost

Alternately, if you have friends who enjoy recreational pharmacological adventures, they likely have their own scale that you can use

There are, what, 3 versions of Vraska that create "You lose the game" effects

III Return target Assassin creature card from your graveyard to the battlefield with an additional +1/+1 counter on it

Crunching numbers is their specialty