Comeback Labour MP Kelvin Davis expects "presents like the blankets and beads of yesteryear" to be produced to woo voters to the Internet-Mana Party alliance.
"Kim Dotcom [who funds the Internet Party] will say all the right things, but he's not about to help Maori - he's motivated by his extradition proceedings," Mr Davis said.
Mana Party leader Hone Harawira and Internet Party chief executive Vikram Kumar announced the alliance and the signing of a memorandum of understanding between the two parties last week.
The parties will retain their own identities, but a new political party - Internet Mana - will be formed to fight the election in September.
Mr Davis claimed Internet-Mana promises made to people in the Te Tai Tokerau electorate would not eventuate.
Mr Davis was sworn into Parliament on Tuesday, replacing Northland Labour list MP Shane Jones who has quit politics.
He entered Parliament in 2008, losing the Te Tai Tokerau seat to then Maori Party encumbent Mr Harawira, but becoming an MP because of his place on the Labour list.
Although in the 2011 byelection and general election Mr Davis whittled down Mr Harawira's majority, he didn't win the seat and missed out on a return to Parliament because of his list ranking.
Mr Davis said he was confident he would win the seat in September with policies, including promoting Maori education.