To help hit that critical mass, Id look to cards like Scute Swarm, Hornet Queen, and Avenger of Zendikar
I recommend you use something like this to check for over/under extrusion
8 Giada, Font of Hope Makes Angel Typal Decks Possible Some creature types are ideal for typcal decks, such as classic creature types like Vampire, Goblin, Elf, Merfolk, and more recently, Eldrazi as well
Add in a Haste enabler like Concordant Crossroads or use a card like Earthcraft that entirely bypasses Summoning Sickness, and Squirrel Girl can start looping into infinite mana and infinite Squirrel tokens
Pick-Two encourages fast, dynamic drafting that's great for kitchen-table play or adding a dash of variety to game night