You still need to legally activate the original ability first, but once its on the stack, any effect that copies abilities can duplicate it and give you the same effect again
The choices of random creature and random graveyard are made as Call from the Grave resolves
This theory meshes with the comments and demographics of notable top Charizard buyers, but when you get to the heart of it, theres just something about Charizards design that has resonated with Pokmon fans and stayed with them throughout the years
In Standard, Alpine Moon has a handful of targets, but I'm not sure any are powerful enough to justify dedicating a sideboard slot to a do-nothing hate card, especially when Field of Ruin is still in the format
Then, when an opponent tries to attack another monster, the player can detach a material and make the monster attack Hope Harbinger instead