An example of this is the Populate mechanic, from Return to Ravnica which let green and white increase the size of their army, but linked it to whatever their best token was at the time saprolings, birds, knights, centaurs and rhinos, depending on how much of anything you had
Anyway, in Commander, he "haunts" another creature, only to reappear when that creature leaves the battlefield
Event Hourglasses These hourglasses aren't as important as the other two and only see use in special events, like the Blastoise Event that is currently underway
very much a social phenomenon, this is reflected in the Nintendo DS game which allows players to embark on two-player duels against like-minded friends
Plus, you get to meet regional buyers who are always hunting for specific Pokmon card types regardless of rarity, and are ready to pay cash to grab them right away