Everyone underrated this card the first time around, in Theros block
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Gargos still remains relevant even once you've assembled your mountain of mana, thanks to its second ability
In games where you dont have enough lands or the right colors to cast them, they fix that problem
Then, select the deck you want to personalize, and when editing that deck, go to More Details, to the right: Notice that sometimes you may miss and to the Sideboard (which is right above More Options), but what youre looking for is the screen shown below: Within a deck's details, you can set individual preferences for companions, sleeves and avatars for when you play that deck
Michael is at the entrance of the Grass Club