Like most Magic: The Gathering cards, the value of Assassin's Trophy depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Assassin's Creed)
Currently, Wizards of the Coast releases between six and ten MTG sets per year
Pokemon Card Strategy: So as far as strategy goes, since this is a stage 1 Pokemon card that has a stage 2 evolution in Gothitelle, I would recommend keeping Gothorita on the bench and evolving it into Gothitelle before putting it into play, I would do this because Gothitelle can do much more damage than Gothorita and it has a higher hp
Selling raw is often faster, safer, and less stressful
Octopus Umbra 3UU Enchantment Aura Enchant creature Enchanted creature has base power and toughness 8/8 and has "Whenever this creature attacks, you may tap target creature with power 8 or less." Totem armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.) Octopus Umbra overwrites all previous effects that set the creature's base power and toughness to specific values
Notable Cards: Reprints and $$ The most expensive card is Anhelo, the Painter at around $10