The idea is simple: you have double the amount of life points as in a normal match (40, rather than 20), and your entire 100-card deck is built around a single legendary creature, your commander
When you have both cards in play and attack with both creatures, the two cards transform, becoming one giant card
Finally, if youre looking for something a bit more high impact, there are a number of mass-reanimate spells available
Between access to mana, cards, and direct damage, it adapts easily to what you need most, while untap effects and protection help you squeeze maximum value out of every activation
I personally believe we still do not have enough data in the competitive scene to truly understand which decks are at the very top of competitive play
If you have two fetch lands in your graveyard when you play it, you can get both back and immediately crack them for four landfall triggers