Plants drink up water, and electricity travels easily through it, so Water decks have to be careful, especially against speedy Lightning builds
Economy Plus ($40/card): declared value under $500
4 Powder Keg (Magic Player Rewards 2004) The only card in this list not printed in the wild year 2010, this Player Rewards print has recently spiked in price
For Gruul mana-fixing, I recommend prioritizing dual lands that count as both Forests and Mountains: Cinder Glade, Stomping Ground, Sheltered Thicket, and Taiga (if you're willing to spend lots of money) add layers of extra synergy to the deck because they can be fetched by lands (Wooded Foothills) and spells (Wood Elves) while also empowering cards that care about land types like Valakut, the Molten Pinnacle and Howl of the Night Pack
The Landfall Renaissance is officially here
This alone could easily create a substantial threat to opponents