It can hit the field on turn 3, and the following turns chapter ability lets you pod a creature for any other creature or basic land, and then put it into your hand
Coming in at the low converted mana cost of two and having a game-ending ability on it, Tinybones will likely become a new favourite of mono-black Commander players everywhere with its unique effect
Tokens are created at the beginning of your end step, and if its a Squirrel, you get two copies
If a triggered ability looks for a permanent changing zones, such as Tameshi, Reality Architect, they still trigger for a token being returned, even if you never put that treasure into your hand
You can basically fill your deck with removal, counterspells and card draw
It doesn't matter if the original target has somehow become illegal itself