Emerald and Rubys split ability to deal with opponents cards while working toward unleashing its own powerful characters makes it a deck that requires some practice to fully understand, needing some careful cardplay - and good luck - to overcome its less forgiving aspects
This all coincides with Magic being at its all-time high for players
What the decks do well is showcase the variety of characters and art in the series
For example, if your commander is [c]Kess, Dissident Mage[/c], you can only play blue, black, and red cards (or cards that are a combination of these colors)
They tend to feel like versions of three-color decks plus a bunch of good stuff from an additional color, which feels unnecessary
Gaea's Blessing (T1, Ext, S, Block) Technically a cantrip, Gaea's Blessing puts your best cards back into your deck (or your opponent's cards into his deck), plus gives you a chance to draw them back