mix and match 

verb : To combine different elements together to form an equivalent deal.

The grocery store allows customers to mix and match different types of products (and still get the reduced price).

mix and match by nick_g July 27, 2010

Mix and match weapon 

A weapon that is a mashup of normal weapons.

Quite possibly the best mix and match weapon is The Dual-Wield Chainsaw [Shotgun Laser Earrings with detachable missile launchers and drink dispensers.

Mix and match weapon by Someone404 March 10, 2020

Mix-and-Match Vaccination 

When people experienced more mild and moderate side effects, such as more frequent chills, headaches, and muscle pain, after they were jabbed with doses of two different vaccines, compared to being vaccinated with doses of the same vaccine.

Mix-and-match vaccination allegedly gives people longer-lasting immunity, better protection against new variants, or simply gives hospitals the flexibility to swap vaccines should supplies be interrupted.

Mix-and-Match Vaccination by MathPlus May 13, 2021