Lucky for us, there are plenty of ways to cheat cards onto the battlefield like One with the Multiverse, Smuggler's Surprise, or Defense of the Heart
More on that a little lower in the article
Partner adds an extra wrinkle to the package, effectively allowing you to run two copies of a commander from among the options with partner
For just two mana it can give any creature lifelink until end of turn, and then when you gain life in any way, you distribute a +1/+1 counter on a creature or enchantment you control
Once you get these artifacts on the battlefield, they start to boost all your next moves, from creating huge tokens and doubling power to ramping and giving counters
When you attack one opponent with a myriad creature, you get to make token copies of it