If you do it over and over again, you can give your creatures +15/+15 or more
Its mere presence in a format carries strength as a threat
Of course, the only real way to deal with Progenitus is with a board wipe of some kind, but, even then, if it goes into the graveyard you just shuffle it back into your deck
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From Base Set to Modern Expansions The earliest Pokmon card sets featured original Pokmon such as Charizard Blastoise Venusaur Pikachu Over time, expansion sets introduced new Pokmon, mechanics, and artwork styles