mtg 60 card deck breakdown Mighty Mill-60 Deck-rares-magic the Gathering-mtg-blue-black-fast-ready to Play 60 Card Deck - TEMPERED

That said, replacing either the basic Island or an Underground Sea with whichever blue land allows you to splash into a third color can be perfectly fine for sideboard answers and is actually what I do in Legacy for Bant, and what I sometimes try in Modern for Bant as well

If its your first time competing in a tournament, I would definitely double-check the legality of all your cards, but otherwise, take it easy

You can preorder a booster box from your local store and pick it up at the Core Set 2020 Prerelease July 57

Those players who brave the dragonstorms and emerge victorious will make it to Day Two, which features Tarkir: Dragonstorm Draft

The interesting part is that greens card advantage is tied to its creatures, caring about them dealing combat damage or their power