Because there are so many and most decks dont want many, you can get as many as you want in the second half of the pack most of the time
I now have a 5/3 trample that draws me two cards if you kill it
Most of the monsters belonging to this group can special summon themselves from the hand or the graveyard consequently triggering powerful cascades
Unlike formats such as Legacy or Vintage, which permit almost every card ever printed, Pioneer imposes a more structured boundary, which helps in maintaining a balanced metagame and prevents the dominance of overly powerful or disruptive strategies that might arise from older card interactions
There's no gatekeeping here the free tier is genuinely useful, and the paid tier unlocks features (like graded card values and price alerts) for people who want deeper tools
With rotation occurring in each format, decks come and go with each cycle