A cards color identity is determined by any mana symbols in its mana cost, any mana symbols in its rules text, any color indicator, and any color-defining abilities (e for every previous cast from there this game
If an effect would let you cast a spell or activate an ability of a card from a zone other than your hand (e.g., flashback), that card will appear floating to the right of your hand with a white fog around it unless you are specifically focused on the zone it is located in
There is no dominant strategy in this game, otherwise a card deck would either just be comprised of monster cards, trap cards, or spell cards
The best part is that you can have two copies of Misty in your deck, which means setting up two high-energy Pokemon more efficiently
Wrath effects like this are mostly played to deal with creatures, but Farewell sucks up everything in its path
1 Riveteers Charm