While the deck isnt absolutely packed with giant creatures so you can place those -1/-1 counters more freely, many of the creatures present are buffed or gain additional effects by this counter placement
Pokmon cards that were printed only for specific promotional activities, contests, and events are marked with a Promo symbol at center right
Extremely limited distribution
Step right up, step right up
Getting to that point isnt very feasible - its more likely to be knocked out long before then - but with only 40 damage taken, Radiant Heatran will swing for 280 before applying Weakness or Resistance
Instead, include a few powerful ones that work well with incidental graveyard growth and enjoy the extra value, as, in general, chasing threshold wont be worth the effort