If a spell or ability causes you to put cards into your hand without specifically using the word "draw," Messenger Hawk's ability doesn't count them
When Lysandres Trump Card hit with the Phantom Forces expansion, it quickly became the first card to be officially banned in almost a decade
For Death's Shadow, the average converted mana cost is incredibly low (likely the lowest in all of Modern) at 0.76, meaning the average nonland card in the deck costs significantly less than one mana
Whats really cool is that they have multiple levels
Laboratory Maniac FINAL FANTASY: Through the Ages, Uncommon Limited: 1.0 Youd have to be a maniac to try and get Vanadiel Adventurers (Laboratory Maniac) to work in most decks, it is possible that blue/black will want it from time to time (or green/black can splash it with enough graveyard synergies)
Three powerful Green cards are coming as well, Cryptolith Rite, Eldritch Evolution, and Tireless Tracker