I dismissed adding creatures that were not real-life ones (such as Giant Octopus) in order to fill out the theme
The final interesting inclusion in Gonner's list is the doubling up on copies of Knightmare Mermaid, Knightmare Goblin, and Knightmare Phoenix
Afterward, draw a card from your deck
Heres the breakdown: Historical Appreciation Patterns Make It a Winner : Pokmon TCG booster boxes have a proven track record of value growth, especially for sets with iconic mechanics like Mega Evolutions
Another option, if you want a two card combo, and prefer mana to damage, is the sorcery spell Chain Lightning
effects read "when one of your Digimon digivolves," so unless the Digimon for the digivolution is in a state where it can digivolve, the effect can't activate