Though Ive referred to them all under the same umbrella, this deck actually has two varieties: Cards that truly double your counters (Vorinclex, Monstrous Raider) and cards that add an additional counter (Kami of Whispered Hopes)
The general claim is that running the extra card reduces your chances of drawing specific, important cards in your deck, and therefore is bad for your overall results
You can obtain the Mega Gyarados ex (3-Stars rarity) card by opening Mega Rising: Mega Gyarados from Mega Rising set
Double strike is an obvious addition to the team
(Put X +1/+1 counters on it or create an X/X white Spirit creature token.) Welcome, the spirits of House Emesh whispered to Cemal
The change was a natural one, something that has been happening cyclically on the plane for many, many years