Would you have built your nongreen lands deck with other color options, like mono-blue (Cosima, God of the VoyageCosima, God of the Voyage) or even mono-black (Korlash, Heir to BlackbladeKorlash, Heir to Blackblade)
You can help them out by, say, giving them net decks, or by giving them some simple rules to play by (save removal for real threats, hold cards that are useless, stop drinking fucking Fanta), but there will be errors in judgment theyll still make often before the game even starts
#10: Stonecoil Serpent (and Similar) Deck Inclusions: 84,720 decks (1%) There are a plethora of creatures which allow you to pay mana, and have them enter with that many +1/+1 counters
Being a 2-mana cleric with flash makes it good enough to run in cleric typal regardless of power level, though