If this card is in your hand: You can destroy 2 other monsters in your hand and/or face-up on your field, including a WATER monster, and if you do, Special Summon this card, and if you do that, you can banish up to 2 Spell/Trap Cards from your opponent's field and/or Graveyard, if both the destroyed monsters were WATER
For example, the set's Collector Boosters a product normally priced at $27 or so are listed for a frankly unbelievable sum of $37.99
In other cases, damage counters from the effect of a Pokemon ability or special conditions work a bit differently in the sense that they are not affected by weakness and resistance
Finally, u/justdengit further clarified how rare MeesterKeem's card actually is and how they'd rate it personally.: "There [are] only 44 PSA 10 in existence so this card is EXTREMELY difficult to grade
Along with that, it reads: At the beginning of your upkeep, exile the top two cards of your library