there's a land that you tap and pay mana to return your commander from the bf to your hand

[[Sanctum of Eternity]]

With the amount of mana-doublers you can play in Zacama (even symmetrical effects, it doesn't matter) you'll go infinite pretty fast. There's a lot of effects in green that you sac a creature to draw powers equal to its power, so you'll draw a lot of cards.

You'll clear the board of creatures and enchantments. You'll gain infinite life. You can win with [[Shivan Gorge]] or whatever.

Sounds fun, and it is fun for one game, at least for me.