A politician who actually manages to change the tax code is an example of someone who effectuates change.
Origin of effectuate; from French effectuer (; from Classical Latin effectus: see effect), with ending after verbs in -ate (e.g., actuate)
transitive verbef·fec·tu·at·ed, ef·fec·tu·at·ing, ef·fec·tu·ates
Origin of effectuateMedieval Latin effectu&amacron;re, effectu&amacron;t-, from Latin effectus, an effect; see effect.
(third-person singular simple present effectuates, present participle effectuating, simple past and past participle effectuated)