Rules of the legion:
1) You are the aggro deck
2) There is no 'over-committing'
3) Spread their sites and your resources so sweepers hurt less
4) Be aware of pain points and mulligan towards answers for them in matchups
5) Try to make a skele every turn and space out your spells so that at three mana, you play a 2 cost with a skele as an example unless you can tell your opponent is stumbling.
6) Draw a site for tempo or if you need to answer defensive sites. Tapping to draw sites is very slow for this deck if you have a lot of gas in hand.
7) Your avatar will often attack in most games unless your threats are mostly answered. Remember your sites are mostly minions too so if you are really behind drawing sites is reasonable instead of moving forward.
8) Only need 5 mana to operate. Try to move forward with the legion aftererwards.
Mulligans:
Must keep:
-Saint of Redemption
-Sister Stefania
-Sinterfee
-Rift Valley
-sinkhole
-river of blood
-Boulevard of bones (on play)
Suspected Earth decks:
-Exhume
Sites:
-Try to only keep one fire site in opener. You want a site that generated a creature on turn 2 ideally and a hate site on your home site.
Other:
1) Ring is hard to beat through but honestly most decks cant keep up so keep attacking. Save bury and EQ.
2) Setup for big onslaughts if spiders are out. Most dont see it coming because they are so focused stemming the bleeding elsewhere on the board.
3) Use rift valley to make defending sites awkward for them
4) Kobolds arent something you just drop in this deck. Its tempo removal. You often trade some amount of generated material plus kobold ping to kill something.
5) Only need one fire site to operate. Dont keep more than one in opening hand.
Matchups:
I wont spoil this yet because it has some hilarious matchups in your favor, matchups you think would be bad but are about even, and some clear one sided games not in your favor.