Not sure what your budget is, but other handy lands include Reflecting Pool, Field of the Dead (if you can swap out some lands for snow lands), Mana Confluence, Temple of the False God, the Fetches on-color (or even Prismatic Vista or Fabled Passage if you're basic-heavy)
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So if youre not overloading your opponent with them, theres virtually no way something like Thing in the Ice or Jace, Vryns Prodigy or any other cheap creature is going to survive if its your only target
You can also use flicker or bounce effects like from Legion's Initiative, which is in red, allowing you to trigger an additional four damage while giving it haste to trigger another four in combat with just two mana
Pressure: This is Mewtwos standard Ability, which depletes extra PP from opponents moves