The only real downside to overloading on Emry and Goblin Engineer is that it exposes you to graveyard hate, but I think that means you just have to be careful about sideboarding in a way that acknowledges and prepares for that
Combos and Interactions I havent built them into this deck, but there are some cards that enable infinite combos
The quantity of boxes you invest in is determined by your financial capacity and the kind of gaming experience you desire
For example, it will take an F2P player 125 days of saving Spark Points to get a single Crown Rare Card
Creature - Warrior Elf Color tag templates(None) Cultivator of Blades Fabricate 2 (When this creature enters, put two +1/+1 counters on it or create two 1/1 colorless Servo artifact creature tokens.) Whenever this creature attacks, you may have other attacking creatures get +X/+X until end of turn, where X is this creature's power
This action happens after the first strike damage has been done by Shark Shredder