At common, we only included a handful of typal cards, and they all had a threshold of one, meaning that to optimize them, you only had to have one creature of that type on the battlefield
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This aggressive deck has some great cards, such as Screamer Killer and Winged Hive Tyrant, that are also a good place to start for new players
Flying gives him early evasive pressure, but the real threat comes when he leaves the battlefield: you may pay any amount of accumulated mana to deal that much damage to a player
You've also got ninjutsu, which lets you swap an unblocked creature with a ninja for a cost, and can be a lot of fun to play with, but mostly in casual formats