Mindleech Mass is expensive, but it pays for itself if it manages to get through
These can be incorporated into your decks as a subtheme sometimes, or they can occasionally be a main theme in a very particular/lucky draft
By sheer volume, it's seen most in The Ur-DragonThe Ur-Dragon decks, though by percentage it appears most frequently in Kona, Rescue BeastieKona, Rescue Beastie decks at a 40% clip
Griselbrand As one of the best card draw effects in black, not to mention a massive flying threat, Griselbrand is probably the most-played demon in MTGs history, despite being banned in EDH
Until this point, it's only ever been reprinted in supplemental MTG sets, so this is a pretty momentous occasion