With multiple Greninja BREAKs on the board and some energy in your hand (Fisherman, anyone?), you can do some serious damage to your opponents Pokemon to take some easy prizes, and thats before you even attack
For a long time, I focused heavily on flicker spells, thinking they were my best option for maximizing ally triggers
"Destroy" effects are relatively easy to deal with, since indestructible and regeneration work so well against them
Collectors prize it for its gorgeous shiny Eeveelution artwork and scarcity (it was obtainable only by redeeming points in Pokmon leagues)
3 Trainer, similarly awarded to winners in Japanese Pokmon tournaments during the late 1990s, are almost as rare and valuable
Point-removal spells like Swords to PlowsharesSwords to Plowshares and wraths, also known as board wipes (named for Wrath of GodWrath of God) are what I'd consider to be offensive interaction