Ironically, Griselbrand almost singlehandedly drove Reanimator out of the metagame in Legacy, by making Sneak and Show so consistent that there's not much reason to go through your graveyard but, whenever graveyard hate diminishes, top players often pick up the Exhume-based combo again in order to be faster than the Sneak and Show deck
A player loses the game after having been dealt 21 combat damage from any one of them, not from both of them combined (although your Background wont usually be a creature anyway)
(To mill a card, a player puts the top card of their library into their graveyard.) Illustrated by Yeong-Hao Han Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Locus of the Roil is probably the best for a typal Elemental deck, having an ETB and a Landfall trigger that relates to Elementals
The game has thousands of cards so you can always find a way to express yourself on the battlefield