Depending on the type, each set will normally have its own theme, either based around a particular fictional setting in the lore, or perhaps tailored to one particular mode of play, like the Commander or Modern formats
Top candidates include chase cards like Pikachu ex SAR, Charizard ex SAR, and popular character SARs from recent sets
Pumping your creatures by 3 toughness to survive a Toxic Deluge is also pretty epic
For tournament play, reduce to 60
Lapras has the following attacks: Hydro Pump - 20 damageIf this Pokmon has at least 1 extra Water Energy attached, this attack does 70 more damage
Myrs are compact, tessellate well (see Myr Battlesphere), and are extremely useful around the house