If the ability divides damage or distributes counters among a number of targets (for example, the ability of Verdurous Gearhulk), the division and number of targets can't be changed
Also, Armageddon is technically a board wipe, but using it will mark you for life as a bad person
Call For Backup has so many ways to give a ton of +1/+1 counters to your creatures, which makes practically every card in the deck a giant threat
On the other hand, because of my shortage of early plays, getting mana hosed was very possible, and would be particularly devastating
Lewins also a podcast contributor, served as Video Game History Foundation co-director, and brought a deep personal and scholarly perspective