Their contents vary with each set, and they show off different aspects of the game
Even in an Un -set friendly game this has literal zero merit outside of maybe winning the game, and seems like more of a hassle to track than anything
Loxodon Hierarch was the ultimate keep me alive creature
Number 446 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Not Legal Formats Alchemy, Pauper Rulings (3/16/2018) While Rest in Peace is on the battlefield, abilities that trigger whenever a creature dies won't trigger because cards and tokens are never put into a player's graveyard
You cant directly counter the act of investigating, because investigate isnt a spell or a standalone ability on the stack