Hedron Crab is certainly the more flexible of the two because you can use it to enable your own graveyard, but both of these cards are fantastic mill engines for 60-card formats
The discard effect is designed to be cumulative so that the cards keep threatening this one aspect of the game
Enjoy gaining life and attacking with massive flying creatures
Buzzard-Wasp Colony's last ability puts all counters that were on the creature that died onto Buzzard-Wasp Colony, not just its +1/+1 counters
You dont copy any modifications the copied token currently has when you populate, and this includes counters, auras, equipment, etc
The uncut sheet - produced before the individual cards are cut out later in the manufacturing process - includes all 16 of the holographic shiny cards from the Pokmon TCGs 1999 Base Set, its first English-language release