Hammer Hammer is debatably a combo deck, but given its proclivity to attack early and often, it is close enough for me to consider it an aggressive strategy
The deck features a number of strong green creatures, including Yorvo which gets stronger each time you cast a green creature, Thunderous snapper to draw cards, and Beanstalk Giant which both helps with acceleration and comes out as a HUGE creature
Oh, and those are also both cats something to note for Pioneer or future Standard sets, perhaps
Some split cards such as Who // What // When // Where // Why are part of the un-sets, and so aren't legal to play in most formats
There are a ton of ways to maximize the mana generation of this card (cough elves), and the massive mana income you get from Gaeas Cradle can be used to fuel your swarm or to bring out big spells or giant monsters that green loves so much
The Eleventh Doctor The Eleventh Doctor is meant to work in tandem with the Time Counter theme of the Timey Wimey deck