Sagas are another enchantment subtype that can also be built around easily and powerfully, guided by Terra, Magical AdeptTerra, Magical Adept, Tom BombadilTom Bombadil, and several other good options
When you cast Bloodline Culling you can have a creature get -5/-5 until end of turn, which can be useful for killing off any specific threat, but especially those that are indestructible, as they dont die through normal means
CCGCastle On CCGCastle, youll earn a few cents for each card, unless a card is particularly rare
I'd also recommend Shuckle for its Fermented Juice Ability, it allows trainers to heal any Pokmon in play by 30 damage providing a grass energy is attached
In the case of in-person selling, choose only the best and most valuable cards
They don't copy whether that creature was tapped or untapped, whether it had any counters on it or Auras and Equipment attached to it, and so on