Stock Up rebuilds our hand after Thoughtseize and helps dig past their Counterspell/Force of Negation/Spell Snare suite, giving card selection that Malevolent Rumble can't match against a deck full of interaction. Dismember cheaply kills Orcish Bowmasters and Psychic Frog before they take over the game. Summoner's Pact is dangerous against four Force of Negation and heavy discard that can strand us on the payment turn, so cut it here. This matchup is a grind, so prioritize resolving threats through their counterspells and disruption over raw ramp density.