This is the main reason Veil of Summer is less relevant in Legacy as well its just not as good when counterspells are more mana efficient, as they can just cast another one to stop the Veil itself
1 Dromoka, the Eternal
Granted, these effects take place at the end of your turn, softening their impact somewhat, but they can still spin out of hand in an Aristocrats deck if you can get a good sacrifice loop going
Winter Orb and Static Orb are the go-to lockdown pieces to abuse this ability
People flock towards the 2-mana ramp effects, but Search for Tomorrow is so much better than a typical Rampant Growth if you suspend it on turn 1, freeing up your turn 2 to cast other spells, and giving you access to the same amount of mana on turn 3
This, of course, comes with the caveat that you didnt open an error kit, which does occasionally happen