This decks chemistry with the mid game is amazing. Embiggen druid decks can be tough to play. The card "embiggen" must be played properly in terms of the cost monster that you have in hand, and the ratios of what  monsters you will play coming turns.

Strength in numbers/ Breath of dreams- are a couple of other spells that are great to open up with in the early game. The way this deck is built, it ramps up mana very early to mid game. Allowing you to summon extremely powerful, and troublesome monsters like " Emerald dragon" if you need solid defense + extra dragon, or with the right cards;  stronger monsters like "Scrapyard Colossus and Colossus of the Moon" by mid game (Turns 5-10).

Escaped Manasaber-is a spicy add that I've worked into the deck. Playing it on turn 4 allows you to climb to 6 mana on turn 5 for easy "Emerald Dragons," or "Big Ol' Welps" buffed from "Embiggen." If it manages to stay on the field, you will find yourself easily ramping into higher cost cards buffed by "Embiggen" as the match continues into the later turns.

Marsh Hyrda-is a very powerful 7 cost minion that takes the placement of "Evasive Wyrm" in this build. Its high 7/7 stats make it a great rush minion. The 8 cost minion grab will help in grind matches against control, and otk type variants. 

Colossus of the Moon-Proves to be a very useful tool giving how easy it is to ramp with this deck. If he hits the field with a proper taunt in the way, or through the trigger of "Strength in numbers," your opponent will find themselves in a single turn swing. Where they might not have enough, or spend to much to clear your field.

To bring some closure to the strategy of this build, think BIG FAST! Lay those huge minions on your opponent fearlessly. Your opponent is going to cringe watching huge buffed minions hitting the field, when they didn't have an answer to the one you played the previous turn. Good luck and have fun.!