Jeskai Energy is aggressive and mostly white/red with some blue, so Veil of Summer's hexproof from blue/black won't stop much of their removal directly, but its uncounterable clause and free cantrip mode help you resolve your combo pieces past their Quantum Riddler or sideboard counterspells like Spell Snare. Nature's Claim is strong against their Thraben Charm-adjacent enchantment threats or any artifact-based disruption, and can proactively answer problematic permanents before they stabilize the board with Ocelot Pride tokens. Pact of Negation's delayed payment is risky against a deck this fast with Ragavan, Nimble Pilferer and Ajani, Nacatl Pariah applying pressure, so you want to spend mana on resolving threats, not holding up reactive counters you may not be able to pay off. Disciple of Freyalise's sacrifice-for-value plan is too slow against their proactive curve, so trimming it for cheap interaction is correct.