Mana Drain does benefit from complementary deck design which is basically useful ways to expend an influx of colourless mana but beyond this it is very good in any kind of deck
Once you upload your photo, go ahead and type out your character description, important stats, interesting trivia about the character, and fill in the remaining sections with information that you think is important
Pair it with heavy mill cards like Mind Funeral or Drown in Dreams, and it quickly becomes a massive, unstoppable threat
Where to Find Reliable Pokmon Card Guides and Resources Utilize expert resources for further research: Online guides (CGC, Wargamer, UniKeep)
There's also some really great artwork
Every time your Ancient Silver Dragon deals combat damage, you get to roll a die to determine how many cards you draw