What should your deck do?
Pick the idea first. The next screen lists the commanders people build for it, with the ones you already own at the top.
Tokens
Make lots of small creatures out of nothing, then win with the crowd.
+1/+1 counters
Grow a few creatures a bit at a time until they are enormous.
Kindred
Pick a creature type you like and play the cards that reward you for it.
Graveyard
Treat your graveyard as a second hand you can spend from.
Lifegain
Climb out of reach, then turn a huge life total into a win.
Sacrifice
Spend your own permanents on purpose, because something pays you when they go.
Aristocrats
Sacrifice your own creatures and drain the table a point at a time.
Spellslinger
Play instants and sorceries, and run creatures that reward you for casting them.
Voltron
Pile equipment and auras onto one creature until it can win on its own.
Reanimation
Put something enormous in the graveyard early, then bring it back cheaply.
Life drain
Take life from everyone else and add it to your own, over and over.
Mill
Empty your opponents' libraries instead of attacking them.
Discard
Strip your opponents' hands and keep them off balance.
Stax
Slow the whole table down with rules that cost everybody else more than they cost you.
Wheels
Make everyone discard their hand and draw a new one, then punish them for it.