It's great to keep your creatures coming back, especially if you can turn the -1/-1 counter into an upside, like we discussed with Blight
Instead of spells resolving in complete batches, players could now interact on the stack at any point, interrupts were removed from the game, combat damage used the stack, and the rules deactivating tapped artifacts and preventing tapped blockers from dealing damage were removed
Master Set Completion Difficulty: Collector Tips: Neo Genesis is notorious for difficult centering and factory print-quality issues
Even if I have two creatures, its effectively like Bone Pit Giant will deal full damage to each one individually
[/spoiler] [spoiler=Poison of the Old Man] Even though this simultaneously obsoletes both Dian Keto the Cure Master and Ookazi, it is nothing special in a deck where cards deal upward of 2000 damage
There are probably a lot of ways people are going to think of to use this energy, however many powerful attackers need two energies to get their attack off, meaning this card is likely to be a powerful addition to many decks