Try GBAtemp.net, google search it
They can obfuscate their presence to avoid detection when spying on other creatures
Those constructed build restrictions allow R&D to throw in a bit more spice than usual, a bit like a gold card, and so legends tend to have a high average power level
Nykthos, Shrine to Nyx Nykthos, Shrine to Nyx asks you to make a critical deckbuilding restriction to one color, but the reward is a handsome sum of mana to cast an unreasonable number of spells with
If there were fewer, I could maybe maintain a deck for each, but as someone who might play cEDH, Old School, Premodern, Legacy, Modern, Pioneer, Standard, Pauper, and even Vintage, its just too much to keep a tournament ready deck for anything I might want to play
But it's not really a Block in the modern sense of the word, unlike the MirVLight Block that was about to hit and make it big