It becomes a WATER monster, and gains 1000 ATK
The rewards vary, but usually, they unlock exclusive cards and cosmetics
In other words, the problem is non-computable
One of the leaders is Zahur, Glory's Past, and one of the team's Vehicles is Cryptcaller Chariot The Speedbrood - Black and Green color identity
Fortunately, Pokmon Legends: Arceus makes swapping moves incredibly easy, allowing Pokmon battles to be much more dynamic than previous games since players need to strategize about which moves they need to approach each new battle
But I can't expect every Magic innovation to perfectly marry theme and gameplay and Tales of Middle-earth still provides a rich interpretation of a formative and profound story