The card art is what boosts Pacifism to its place here, even if it isn't the most useful card, as the striking contrast in colors is more important
So as far as strategy goes you would want to have this card in a fighting and water type deck, but more than likely you could have a deck of either of the energy cards and just use a special energy card for the energy type you don't have since most of the energy cards required for this card need colorless energy
The rise in popularity of the horror genre brought about a wave of zombie-related media, one of the most prominent of which is AMCs The Walking Dead
Odyssey brought us three blue Thought Beasts--Thought Nibbler, Thought Eater, and Thought Devourer--all of which reduced your maximum hand size by two, three, and four, respectively
Dragonfire Blade is a one-mana piece of equipment that grants a solid +2/+2 and gives the equipped creature hexproof from multicolored spells and abilities