Last Breath cleanly exiles small threats like Arbor Elf or an early cascade-generated creature at power 2 or less, giving them 4 life, which matters little against their ramp-into-big-threats plan. Goliath Paladin is a durable 3/6 vigilance body that also takes the initiative, giving you a strong blocker and clock against their larger green and red creatures like Annoyed Altisaur and Boarding Party. Negate is weak since their gameplan is almost entirely creatures and land-destruction sorceries like Mwonvuli Acid-Moss and Thermokarst which still dodge Negate's noncreature-only restriction in relevance but rarely need to be countered proactively, so two copies come out along with one Prohibit, which struggles against their bigger cascade-triggered spells. Keep Snap and Ephemerate to buy tempo against their ramp draws and use card selection to find answers before they land a haymaker.