If you get 1-14, you get to create a copy of that Creature thats tapped and attacking, but you exile it at the end of combat
What makes Otrimi, The Ever-Playful great is when it deals combat damage to a player, you can return a creature with mutate from your graveyard to your hand
New players conflate these
If you prefer to keep a general around you can always use Prison Term, which has the added advantage of being able to shift around when bigger threats hit the battlefield
One of those forgotten decks is "Gengar C", a deck created by Michael Kendle, which was used by Kendle to get Top 4 at Missouri State Championships and to win Illinois State Championships
Emboar Ability: Inferno Fandango As often as you like during your turn, you may attach a Fire Energy card from your hand to 1 of your Pokmon