I dread to think how much my family has spent on them over the years
You can stick with Edgar Markov and build an aggressive Vampire deck by adding more lords, Shared Animosity, and other aggressive tribal-matters cards, or you can go with Licia, Sanguine Tribune and build lifegain combo with Sanguine Bond, Exquisite Blood, Defiant Bloodlord, and the like
Any "as [this creature] enters the battlefield" or "[this creature] enters the battlefield with" abilities of the creature will also work
Charizard is the final stage for a Pokmon called Charmander, however Charizards concept was imagined before Charmanders
Thus, while you might think this card is only worth a few dollars, remember that even Ultra Rare VMAX cards carry a hefty price tag when they come with a 'PLAY
Overall, Staggering Size could see play in certain decks that prioritize combat damage and trample, but its effectiveness may vary depending on the overall strategy of the deck