As one of the commanders of the Counter Blitz Commander deck, Yuna encourages an aggressive +1/+1 counter based gameplan
War Room is a great addition to any mono-color (or colorless) Commander deck, since it allows you to pay three mana and one life to draw a card , plus it produces colorless mana without coming into play tapped
But that doesn't mean anything, any more than it means that either boogeyman Dredge or newcomer Doran is one of the best Extended decks of all time
Countermagic can feel overpowering compared to the removal spells other colors play, as it stops any sort of card before it even enters the battlefield
Just open two of these themed booster packs, mash them together, and you have a deck, lands and all
it gives you an extra land drop every turn, which is exactly what these decks need to do their thing