Since you'll be casting Dragons repeatedly, the best kinds for a deck like this are ones with powerful enter the battlefield effects, like Thunder Dragon
The second ability can draw cards at the same rate we experienced from Cryptbreaker in Standard not long ago, and this the is the ability that will make or break Kumena as it needs to be very good for multiple Kumenas to see play in U/G Merfolk
The Color Pie And Playstyles Each of the five colors of MTG has its strengths, weaknesses, and playstyles
The good thing about using Koga is that you can avoid giving up a point from having Weezing knocked out
Three mana is the sweet spot here, and casting this in your first main to see if it resolves before firing off Day of Judgment is a great play
Its going to be a part of Standard for five hundred years, but thats of no concern to us, the humble Commander players, because we rotate decks every five seconds