Dimir Midrange is loaded with countermagic (Counterspell, Force of Negation, Spell Snare, Subtlety) and disruption (Thoughtseize, Orcish Bowmasters), so our own Thoughtseize helps clear the way for our combo turn or strips a counterspell before we commit our key pieces. Fatal Push is serviceable but less impactful than proactive disruption against a deck that wins on card advantage and countermagic rather than board presence. Kraul Harpooner's reach helps against Psychic Frog once it gains flying. Sequence carefully around their four Counterspells and three Force of Negation by playing around double-spelling into open mana when possible.