That mono - Life deck is quite a good deck - for an unupgraded deck.
If I would upgrade it, I would upgrade the frogs, then the cockatrices, because it benefits Adrenaline.
Play against FGs only, if you have the money for a few upgrades, or you´ll lose much.
Use your predictions of FGs, if possible, against some gods exist good unupgraded decks.
You´ll find enough ideas for Anti-FG decks in the forum. Be careful with the date, some decks are outdated, or were only successful , when Sundial lasted for 2 turns.
I personally started with an own version of SG´s deck, $$man posted.
P.S.
Haven´t played against Top50 for some weeks. Don´t know, which decks are en vogue now.