Commune with the Gods is a strict upgrade to Benefaction of Rhonas, and it doesn't matter how much you pump a virulent sliver, poisonous is not infect, it only gives 1 poison counter per hit no matter the power.

Did not realise poisonous worked like that ty. Benefaction of Rhonas draws 2 cards and prevents you from putting several important cards in the graveyard potentially. I'm switching to Commune with the Gods again however, since I'll put another win-con in the deck to not worry about it.

I actually didn't notice the "and" there. Still probably an upgrade to lower the cmc by switching.

You're taking a turn off just to filter anyway. Getting that extra 1-drop to refuel with Intruder Alarm is often what makes the difference. You are preferably casting it turn 3 to combo on turn 4 so the extra mana is less relevant.