Serum Visions
Given Greens propensity for massive, dangerous monsters and its ability to have far more mana than is reasonable, having flash allows you to suddenly deploy an army of blockers to defeat an incoming attack, or to set up a massive swing to kill your opponent out of nowhere
For example, in Blue/Black, you can cast a spell for Zombies without having any Zombies in your deck since your creatures in your graveyard are now zombies
Ive had a werewolf deck since they first came out and it remains one of my favorites, even if its a bit of a pain to play with sometimes
Ruby/Emerald strengths and weaknesses The current meta is dominated by control and midrange decks, but its always nice to see a powerful aggro deck do well
It does everything from extending the board with creature tokens from effects like Bitterblossoms to drowning you in riches when paired with Smothering Tithe, thus pushing token-based strategies to another level