You can only use this effect of Great Mammoth of the Netherworld once per turn
If they hit $8 or $9 by December, not unreasonable numbers, I will have made about $4 to $7 on each copy
Log In Flash is pretty much a nonbo with his other abilities, as there's really no reason to have him enter play during the opponent's turn when his second ability just gives him haste anyway, his last one requires him to attack, and you don't actually want to block with him ever
If that card is a [F] Energy, attach it to 1 of your Benched Pokmon
Sacrifice, destroy, discard, and counter are all keyword actions that ultimately result in a card being put into a graveyard, however
He is also one of our primary movie reviewers.