They are in most realms and don't have that much synergy, or didn't until Innistrad block where they started to get some tribal love
is an exciting game, and its main feature is the amazing randomness of game situations, which is ensured by the correct shuffle of cards
This isnt something Ive heard anyone from Wizards of the Coast talk about yet, but if the community reaction is strong enough, its certainly possible for them to implement
+1/+1 counter synergies are very desirable too, and Doubling Season fits perfectly (although this is true for green EDH decks in general)
Custom Handmade Wheel Of Fortune proxies made from real Magic the Gathering card with many different alternated arts available for purchase.
Only I Know What Awaits Scheme When you set this scheme in motion, for each card type among permanents your opponents control, you may put a permanent card of that type from your hand onto the battlefield