When Bone Rattler is put into your graveyard from anywhere, exile it. When you do, create four Reassembling Skeleton token cards and put them into your graveyard.
2019-11-12
A Reassembling Skeleton token card is a 1/1 Skeleton Warrior creature with a mana cost of {1}{B} and the ability "{1}{B}: Return Reassembling Skeleton from your graveyard to the battlefield tapped."
2019-11-12
For effects that look for or modify the creation of tokens, creating token cards isn't the same as creating tokens.
2019-11-12
If a token card is put into a hidden zone, you must use a supplementary token card with a Magic card back to represent it. Since these don't exist yet, you may need to be creative.
2019-11-12
Unlike a normal token, a token card doesn't cease to exist in a zone other than the battlefield. It's both a token and a card. It can move between zones any number of times and continues to exist for the rest of the game.