The goal of the deck is to play creatures and slap counters on them with cards like Maester Seymour then reward you for doing so, drawing you cards with Bred for the Hunt, giving them keywords with Sphere Grid, or protecting them with Inspiring Call, all while your creatures to continue to grow and bash in for more damage
(7/14/2017) If a replacement effect allows a player to modify or replace an event by putting counters on an artifact, creature, enchantment, or land, that player may apply that replacement effect
It will help you survive being aggressive, and triggers a few other cards in the deck
The collection this time around includes Houndoom, Maril, Unown, Sudowoodo, Magnemite, and Shaymin
Thassa, God of the Sea seems like it would be great in a go-wide merfolk deck, and it does have a place there because its activated ability helps with Coastal Piracy types of effects