Aggro decks hit fast and hit hard, but tend to struggle to recover when the tank is empty
CGC states that grading can take 106 to 133 days
This current metagame has a lot of decks that are either faster than Infect (Amulet) or are as fast as Infect but with more ways to interact with them and punish lifeloss from fetchlands, Growth, and Gitaxian Probe
While the Hydra Avatar has gone down a good deal in terms of power - which is really strange to say - it's still a card with a tremendous amount of presence, and hey, it's now Standard legal as well for the next five years thanks to Foundations
With the ability to draw cards by casting Instant and Sorceries, it allows you to keep chaining spells together
The state-based nature of Speed means that even if the Bashtronaut is removed, your engine remains warmed up for future threats that care about your current level