Delve is a fantastically strong mechanic in any format with cheap spells and fetch lands, and getting the best two out of seven cards with no drawback is a huge advantage
You can only activate 1 "Gadget Box" per turn.
In a four-player pod, that means you could be making up to six treasures each turn off the ability, which Olivia can then convert into a massive buff for your whole board
Each of these decks uses two colors and can pack an even more devastating punch if you use them right
While the sages failed to defeat him, they did manage make him retreat, but at a high cost: the sage of the wind, Fiethsing, died, protecting the young girl's life
On the other hand, if your deck was made up entirely of weaker, one-mana spells, you wouldn't be making the best possible play on any turn beyond the first one