Perhaps of a created one you saw last week
The box plunges you straight into Pokmon Legends: Z-A lore
Its first effect allows its owner to Normal Summon an additional Spirit monster
Not normally, but if Shellephant has first strike, double strike, or triple strike, and the creatures it's in combat with have none of them, you can deal damage as a 3/3 and then change it to a 1/4 before normal damage happens
for example, certain types cannot be affected by certain status conditions
It obviously excels in Arcades, the Strategist decks, but the fact that the walls you create have exalted means this could have a home in aggro decks too