The ShiftstonedEternal Power Calculator is a deck-building tool that visualizes your odds of drawing enough Influence and Power based specifically on the cards found in your deck.
Vargo is surprisingly good in today's meta where there are a lot of removal piles that are running like Desecrate, Vanquish, Harsh Rule... They just can't deal with Vargo. Ixtun can, but they typically spend 2 for 1 on your Vargos (except for Ice Bolt, which ramps you) and can't deal with Icaria afterwards.