Strangely, Isshin doesn't care about who controls the attacking creatures, so his ability can also be used defensively with Revenge of Ravens from the much-maligned MTG set Throne of Eldraine and Search the Premises from Modern Horizons 2
Its the first Charizard Nintendo printed and the first to land in the EX era, slotted in as the final Secret Rare at 100/97
Card Set(s) -ONE PIECE CARD THE BEST- [PRB-01] CARD VIEW ST04-016 | C | EVENT Blast Breath Block icon 1 Type The Four Emperors/Animal Kingdom Pirates Effect [Counter] DON
This potential is only slightly limited by attractions having a cap of ten in constructed formats
If you look at a typical Infect deck list all of its creatures are Phyrexians thanks to an errata a while ago, so The Seedcore works as a dual land (this is could also help open up the possibility of more three-color infect builds rather than the two-color builds which are most popular today), and almost all the most popular Infect creatures are 1/1s, which makes The Seedcores corrupted pump ability especially impactful
The combos are less obvious, and there are lots of things to discover