The best blue creatures often have low casting costs, allowing you to save mana for the rest of your spells and get them onto the battlefield early
The deck's main MTG commander Tidus is all about moving counters around, apparently based on the Sphere Grid level up system, and so it's not surprising Yuna plays around with counters too
Green searches for lands, untaps them, and turns early plays into explosive midgames
It doesn't hurt that he's also a Hero
Turning damage into +1/+1 counters is the real build around here, however, and players are going to love hitting Anti-Venom with 100 damage from Dawnsire to create a truly superlative game-ender
Kastral, the Windcrested Three generic, one white, one blue legendary creature Bird Scout 4/5 Rare Flying Whenever one or more Birds you control deal combat damage to a player, choose one You may put a Bird creature card from your hand or graveyard onto the battlefield with a finality counter on it